chore: eliminate clippy warns

crates/els/completion.rs

@@ -154,7 +154,9 @@ impl<'b> CompletionOrderSetter<'b> {
         {
             orders.push(CompletionOrder::TypeMatched);
         } else if self.arg_pt.map_or(false, |pt| {
-            let Some(return_t) = self.vi.t.return_t() else { return false; };
+            let Some(return_t) = self.vi.t.return_t() else {
+                return false;
+            };
             if return_t.has_qvar() {
                 return false;
             }

crates/els/diagnostics.rs

@@ -75,7 +75,7 @@ impl<Checker: BuildRunnable, Parser: Parsable> Server<Checker, Parser> {
                     .errors
                     .clone()
                     .into_iter()
-                    .chain(artifact.warns.clone().into_iter())
+                    .chain(artifact.warns.clone())
                     .collect();
                 let uri_and_diags = self.make_uri_and_diags(diags);
                 if uri_and_diags.is_empty() {

crates/els/inlay_hint.rs

@@ -146,7 +146,8 @@ impl<'s, C: BuildRunnable, P: Parsable> InlayHintGenerator<'s, C, P> {
             if d_param.sig.raw.t_spec.is_some() {
                 continue;
             }
-            let (Some(ln_end), Some(col_end)) = (d_param.sig.ln_end(), d_param.sig.col_end()) else {
+            let (Some(ln_end), Some(col_end)) = (d_param.sig.ln_end(), d_param.sig.col_end())
+            else {
                 continue;
             };
             let hint = self.type_anot(ln_end, col_end, &d_param.sig.vi.t, false);
@@ -158,7 +159,9 @@ impl<'s, C: BuildRunnable, P: Parsable> InlayHintGenerator<'s, C, P> {
     fn get_subr_def_hint(&self, def: &Def) -> Vec<InlayHint> {
         let mut result = vec![];
         result.extend(self.get_block_hint(&def.body.block));
-        let Signature::Subr(subr) = &def.sig else { unreachable!() };
+        let Signature::Subr(subr) = &def.sig else {
+            unreachable!()
+        };
         if subr.ref_t().is_quantified_subr() && subr.bounds.is_empty() {
             let subr = subr.ref_t().to_string();
             let ty_bounds = format!("|{}|", subr.split('|').nth(1).unwrap_or(""));
@@ -259,7 +262,8 @@ impl<'s, C: BuildRunnable, P: Parsable> InlayHintGenerator<'s, C, P> {
                 if disp_arg.trim_start_matches("::") == &name[..] {
                     continue;
                 }
-                let (Some(ln_begin), Some(col_begin)) = (pos_arg.ln_begin(), pos_arg.col_begin()) else {
+                let (Some(ln_begin), Some(col_begin)) = (pos_arg.ln_begin(), pos_arg.col_begin())
+                else {
                     continue;
                 };
                 // f i -> ...

crates/els/rename.rs

@@ -269,7 +269,7 @@ impl<Checker: BuildRunnable, Parser: Parsable> Server<Checker, Parser> {
         } else if old_uri.as_str().ends_with(".py") {
             let d_er_file = PathBuf::from(old_uri.as_str().replace(".py", ".d.er"));
             if d_er_file.exists() {
-                let Ok(old_uri) =  Url::from_file_path(&d_er_file) else {
+                let Ok(old_uri) = Url::from_file_path(&d_er_file) else {
                     return;
                 };
                 let Ok(new_uri) = Url::parse(&new_uri.as_str().replace(".py", ".d.er")) else {

crates/els/server.rs

@@ -863,7 +863,9 @@ impl<Checker: BuildRunnable, Parser: Parsable> Server<Checker, Parser> {
             .and_then(|p| p.parent().unwrap().read_dir().map_err(|_| ()))
         {
             for neighbor in dir {
-                let Ok(neighbor) = neighbor else { continue; };
+                let Ok(neighbor) = neighbor else {
+                    continue;
+                };
                 let uri = NormalizedUrl::from_file_path(neighbor.path()).unwrap();
                 if let Some(mod_ctx) = &self.modules.get(&uri) {
                     ctxs.push(&mod_ctx.context);

crates/erg_common/python_util.rs

@@ -562,7 +562,10 @@ pub fn opt_which_python() -> Result<String, String> {
         return Err(format!("{}: {python} not found", fn_name_full!()));
     };
     let Ok(res) = String::from_utf8(out.stdout) else {
-        return Err(format!("{}: failed to commnunicate with Python", fn_name_full!()));
+        return Err(format!(
+            "{}: failed to commnunicate with Python",
+            fn_name_full!()
+        ));
     };
     let res = res.split('\n').next().unwrap_or("").replace('\r', "");
     if res.is_empty() {

crates/erg_compiler/codegen.rs

@@ -90,7 +90,9 @@ fn escape_name(name: &str, vis: &VisibilityModifier, def_line: u32, def_col: u32
 fn escape_ident(ident: Identifier) -> Str {
     let vis = ident.vis();
     if &ident.inspect()[..] == "Self" {
-        let Ok(ty) = <&Type>::try_from(ident.vi.t.singleton_value().unwrap()) else { unreachable!() };
+        let Ok(ty) = <&Type>::try_from(ident.vi.t.singleton_value().unwrap()) else {
+            unreachable!()
+        };
         escape_name(
             &ty.local_name(),
             &ident.vi.vis.modifier,
@@ -1098,7 +1100,9 @@ impl PyCodeGenerator {
     fn emit_trait_block(&mut self, kind: DefKind, sig: &Signature, mut block: Block) -> CodeObj {
         debug_assert_eq!(kind, DefKind::Trait);
         let name = sig.ident().inspect().clone();
-        let Expr::Call(mut trait_call) = block.remove(0) else { unreachable!() };
+        let Expr::Call(mut trait_call) = block.remove(0) else {
+            unreachable!()
+        };
         let req = if let Some(Expr::Record(req)) = trait_call.args.remove_left_or_key("Requirement")
         {
             req.attrs.into_iter()
@@ -1770,7 +1774,7 @@ impl PyCodeGenerator {
             // else block
             let idx_else_begin = match self.py_version.minor {
                 Some(11) => self.lasti() - idx_pop_jump_if_false - 2,
-                Some(10 | 9 | 8 | 7) => self.lasti() + 2,
+                Some(7..=10) => self.lasti() + 2,
                 _ => self.lasti() + 2,
             };
             self.fill_jump(idx_pop_jump_if_false + 1, idx_else_begin - 2);
@@ -1830,7 +1834,9 @@ impl PyCodeGenerator {
         // but after executing this instruction, stack_len should be 1
         // cannot detect where to jump to at this moment, so put as 0
         self.write_arg(0);
-        let Expr::Lambda(lambda) = args.remove(0) else { unreachable!() };
+        let Expr::Lambda(lambda) = args.remove(0) else {
+            unreachable!()
+        };
         // If there is nothing on the stack at the start, init_stack_len == 2 (an iterator and the first iterator value)
         let init_stack_len = self.stack_len();
         let params = self.gen_param_names(&lambda.params);
@@ -1849,7 +1855,7 @@ impl PyCodeGenerator {
                 self.write_arg(0);
                 self.fill_jump(idx + 1, self.lasti() - idx_for_iter);
             }
-            Some(10 | 9 | 8 | 7) => {
+            Some(7..=10) => {
                 self.write_instr(Opcode309::JUMP_ABSOLUTE);
                 self.write_arg(0);
                 self.fill_jump(idx + 1, idx_for_iter);
@@ -1884,7 +1890,9 @@ impl PyCodeGenerator {
         self.write_instr(Opcode310::POP_JUMP_IF_FALSE);
         self.write_arg(0);
         self.stack_dec();
-        let Expr::Lambda(lambda) = args.remove(0) else { unreachable!() };
+        let Expr::Lambda(lambda) = args.remove(0) else {
+            unreachable!()
+        };
         let init_stack_len = self.stack_len();
         let params = self.gen_param_names(&lambda.params);
         self.emit_frameless_block(lambda.body, params);
@@ -1929,7 +1937,9 @@ impl PyCodeGenerator {
                 self.dup_top();
             }
             // compilerで型チェック済み(可読性が下がるため、matchでNamedは使えない)
-            let Expr::Lambda(mut lambda) = expr else { unreachable!() };
+            let Expr::Lambda(mut lambda) = expr else {
+                unreachable!()
+            };
             debug_power_assert!(lambda.params.len(), ==, 1);
             if !lambda.params.defaults.is_empty() {
                 todo!("default values in match expression are not supported yet")
@@ -2084,7 +2094,9 @@ impl PyCodeGenerator {
             return self.deopt_instr(ControlKind::With, args);
         }
         let expr = args.remove(0);
-        let Expr::Lambda(lambda) = args.remove(0) else { unreachable!() };
+        let Expr::Lambda(lambda) = args.remove(0) else {
+            unreachable!()
+        };
         let params = self.gen_param_names(&lambda.params);
         self.emit_expr(expr);
         self.write_instr(Opcode311::BEFORE_WITH);
@@ -2132,7 +2144,9 @@ impl PyCodeGenerator {
             return self.deopt_instr(ControlKind::With, args);
         }
         let expr = args.remove(0);
-        let Expr::Lambda(lambda) = args.remove(0) else { unreachable!() };
+        let Expr::Lambda(lambda) = args.remove(0) else {
+            unreachable!()
+        };
         let params = self.gen_param_names(&lambda.params);
         self.emit_expr(expr);
         let idx_setup_with = self.lasti();
@@ -2185,7 +2199,9 @@ impl PyCodeGenerator {
             return self.deopt_instr(ControlKind::With, args);
         }
         let expr = args.remove(0);
-        let Expr::Lambda(lambda) = args.remove(0) else { unreachable!() };
+        let Expr::Lambda(lambda) = args.remove(0) else {
+            unreachable!()
+        };
         let params = self.gen_param_names(&lambda.params);
         self.emit_expr(expr);
         let idx_setup_with = self.lasti();
@@ -2238,7 +2254,9 @@ impl PyCodeGenerator {
             return self.deopt_instr(ControlKind::With, args);
         }
         let expr = args.remove(0);
-        let Expr::Lambda(lambda) = args.remove(0) else { unreachable!() };
+        let Expr::Lambda(lambda) = args.remove(0) else {
+            unreachable!()
+        };
         let params = self.gen_param_names(&lambda.params);
         self.emit_expr(expr);
         let idx_setup_with = self.lasti();
@@ -2270,7 +2288,9 @@ impl PyCodeGenerator {
             return self.deopt_instr(ControlKind::With, args);
         }
         let expr = args.remove(0);
-        let Expr::Lambda(lambda) = args.remove(0) else { unreachable!() };
+        let Expr::Lambda(lambda) = args.remove(0) else {
+            unreachable!()
+        };
         let params = self.gen_param_names(&lambda.params);
         self.emit_expr(expr);
         let idx_setup_with = self.lasti();
@@ -2485,7 +2505,9 @@ impl PyCodeGenerator {
     /// TODO: should be `X = X + 1` in the above case
     fn emit_call_update_311(&mut self, obj: Expr, mut args: Args) {
         log!(info "entered {}", fn_name!());
-        let Expr::Accessor(acc) = obj else { unreachable!() };
+        let Expr::Accessor(acc) = obj else {
+            unreachable!()
+        };
         let func = args.remove_left_or_key("f").unwrap();
         if !self.mutate_op_loaded {
             self.load_mutate_op();
@@ -2510,7 +2532,9 @@ impl PyCodeGenerator {
     /// X = X + 1
     fn emit_call_update_310(&mut self, obj: Expr, mut args: Args) {
         log!(info "entered {}", fn_name!());
-        let Expr::Accessor(acc) = obj else { unreachable!() };
+        let Expr::Accessor(acc) = obj else {
+            unreachable!()
+        };
         let func = args.remove_left_or_key("f").unwrap();
         if !self.mutate_op_loaded {
             self.load_mutate_op();

crates/erg_compiler/context/compare.rs

@@ -98,8 +98,12 @@ impl Context {
                 return self.same_type_of(l.as_ref(), r.typ());
             }
             (l, r) if l.has_unbound_var() || r.has_unbound_var() => {
-                let Ok(lt) = self.get_tp_t(l) else { return false; };
+                let Ok(lt) = self.get_tp_t(l) else {
-                let Ok(rt) = self.get_tp_t(r) else { return false };
+                    return false;
+                };
+                let Ok(rt) = self.get_tp_t(r) else {
+                    return false;
+                };
                 return self.same_type_of(&lt, &rt);
             }
             _ => {}
@@ -796,7 +800,7 @@ impl Context {
                 };
                 ctx.type_dir(self)
                     .into_iter()
-                    .chain(mod_fields.into_iter())
+                    .chain(mod_fields)
                     .map(|(name, vi)| {
                         (
                             Field::new(vi.vis.modifier.clone(), name.inspect().clone()),

crates/erg_compiler/context/eval.rs

@@ -421,7 +421,9 @@ impl Context {
         match acc {
             Accessor::Ident(ident) => self.get_mod(ident.inspect()),
             Accessor::Attr(attr) => {
-                let Expr::Accessor(acc) = attr.obj.as_ref() else { return None; };
+                let Expr::Accessor(acc) = attr.obj.as_ref() else {
+                    return None;
+                };
                 self.get_mod_ctx_from_acc(acc)
                     .and_then(|ctx| ctx.get_mod(attr.ident.inspect()))
             }

crates/erg_compiler/context/generalize.rs

@@ -858,7 +858,9 @@ impl<'c, 'q, 'l, L: Locational> Dereferencer<'c, 'q, 'l, L> {
     //     ?T -> K(?T)
     //     ?T -> ?U(:> ?T)
     fn eliminate_needless_quant(&mut self, subr: Type) -> TyCheckResult<Type> {
-        let Ok(mut subr) = SubrType::try_from(subr) else { unreachable!() };
+        let Ok(mut subr) = SubrType::try_from(subr) else {
+            unreachable!()
+        };
         let essential_qnames = subr.essential_qnames();
         let mut _self = Dereferencer::new(
             self.ctx,
@@ -1227,7 +1229,9 @@ impl Context {
             hir::Expr::Def(def) => {
                 let qnames = if let Type::Quantified(quant) = def.sig.ref_t() {
                     // double quantification is not allowed
-                    let Ok(subr) = <&SubrType>::try_from(quant.as_ref()) else { unreachable!() };
+                    let Ok(subr) = <&SubrType>::try_from(quant.as_ref()) else {
+                        unreachable!()
+                    };
                     subr.essential_qnames()
                 } else {
                     qnames.clone()
@@ -1245,7 +1249,9 @@ impl Context {
             }
             hir::Expr::Lambda(lambda) => {
                 let qnames = if let Type::Quantified(quant) = lambda.ref_t() {
-                    let Ok(subr) = <&SubrType>::try_from(quant.as_ref()) else { unreachable!() };
+                    let Ok(subr) = <&SubrType>::try_from(quant.as_ref()) else {
+                        unreachable!()
+                    };
                     subr.essential_qnames()
                 } else {
                     qnames.clone()

crates/erg_compiler/context/inquire.rs

@@ -426,11 +426,10 @@ impl Context {
             .skip(1)
             .map(|a| ParamTy::Pos(a.expr.ref_t().clone()))
             .collect::<Vec<_>>();
-        let Some(mut return_t) = branch_ts.get(0).and_then(|branch| {
+        let Some(mut return_t) = branch_ts
-            branch.typ()
+            .get(0)
-                .return_t()
+            .and_then(|branch| branch.typ().return_t().cloned())
-                .cloned()
+        else {
-        }) else {
             return Err(TyCheckErrors::from(TyCheckError::args_missing_error(
                 self.cfg.input.clone(),
                 line!() as usize,
@@ -926,12 +925,16 @@ impl Context {
             for ty in intersecs.iter() {
                 match (ty.is_method(), input_t.is_method()) {
                     (true, false) => {
-                        let Type::Subr(sub) = &mut input_t else { unreachable!() };
+                        let Type::Subr(sub) = &mut input_t else {
+                            unreachable!()
+                        };
                         sub.non_default_params
                             .insert(0, ParamTy::kw(Str::ever("self"), obj.t()));
                     }
                     (false, true) => {
-                        let Type::Subr(sub) = &mut input_t else { unreachable!() };
+                        let Type::Subr(sub) = &mut input_t else {
+                            unreachable!()
+                        };
                         sub.non_default_params.remove(0);
                     }
                     _ => {}
@@ -940,7 +943,9 @@ impl Context {
                     return Ok(ty.clone());
                 }
             }
-            let Type::Subr(subr_t) = input_t else { unreachable!() };
+            let Type::Subr(subr_t) = input_t else {
+                unreachable!()
+            };
             Err(TyCheckError::overload_error(
                 self.cfg.input.clone(),
                 line!() as usize,
@@ -1207,7 +1212,8 @@ impl Context {
                 namespace.caused_by(),
                 op.inspect(),
                 None,
-            ).into());
+            )
+            .into());
         };
         // not a `Token::from_str(op.kind, cont)` because ops are defined as symbols
         let symbol = Token::symbol_with_loc(Str::rc(cont), Location::concat(&args[0], &args[1]));
@@ -1261,7 +1267,8 @@ impl Context {
                 namespace.caused_by(),
                 op.inspect(),
                 None,
-            ).into());
+            )
+            .into());
         };
         let symbol = Token::symbol(cont);
         let ident = Identifier::private_from_token(symbol.clone());
@@ -1637,7 +1644,7 @@ impl Context {
                     .map_or(vec![], |ctx| vec![ctx])
             })
             .unwrap_or(vec![]);
-        let fallbacks = one.into_iter().chain(two.into_iter());
+        let fallbacks = one.into_iter().chain(two);
         for typ_ctx in fallbacks {
             if let Some(call_vi) = typ_ctx.get_current_scope_var(&VarName::from_static("__call__"))
             {

crates/erg_compiler/context/instantiate.rs

@@ -203,7 +203,9 @@ impl TyVarCache {
         // T<inst> is uninitialized
         // T<inst>.link(T<tv>);
         // T <: Eq(T <: Eq(T <: ...))
-        let Type::FreeVar(free_inst) = inst else { todo!("{inst}") };
+        let Type::FreeVar(free_inst) = inst else {
+            todo!("{inst}")
+        };
         if free_inst.constraint_is_uninited() {
             inst.destructive_link(tv);
         } else {
@@ -279,7 +281,9 @@ impl TyVarCache {
             inst.destructive_link(tp);
         } else {
             let old_type = free_inst.get_type().unwrap();
-            let Ok(tv) = <&FreeTyParam>::try_from(tp) else { todo!("{tp}") };
+            let Ok(tv) = <&FreeTyParam>::try_from(tp) else {
+                todo!("{tp}")
+            };
             let new_type = tv.get_type().unwrap();
             let new_constraint = Constraint::new_type_of(ctx.intersection(&old_type, &new_type));
             free_inst.update_constraint(new_constraint, true);

crates/erg_compiler/context/instantiate_spec.rs

@@ -909,7 +909,9 @@ impl Context {
                 } else if ctx.kind.is_type() && !ctx.params.is_empty() {
                     Ok(TyParam::t(poly(ctx.name.clone(), args)))
                 } else {
-                    let ast::ConstExpr::Accessor(ast::ConstAccessor::Local(ident)) = app.obj.as_ref() else {
+                    let ast::ConstExpr::Accessor(ast::ConstAccessor::Local(ident)) =
+                        app.obj.as_ref()
+                    else {
                         return type_feature_error!(self, app.loc(), "instantiating const callee");
                     };
                     Ok(TyParam::app(ident.inspect().clone(), args))
@@ -1095,7 +1097,7 @@ impl Context {
                         self,
                         bin.loc(),
                         &format!("instantiating const expression {bin}")
-                    )
+                    );
                 };
                 let lhs = self.instantiate_const_expr(
                     &bin.lhs,
@@ -1117,7 +1119,7 @@ impl Context {
                         self,
                         unary.loc(),
                         &format!("instantiating const expression {unary}")
-                    )
+                    );
                 };
                 let val = self.instantiate_const_expr(
                     &unary.expr,

crates/erg_compiler/context/register.rs

@@ -950,7 +950,9 @@ impl Context {
     /// HACK: The constant expression evaluator can evaluate attributes when the type of the receiver is known.
     /// import/pyimport is not a constant function, but specially assumes that the type of the module is known in the eval phase.
     fn pre_import(&mut self, def: &ast::Def) -> TyCheckResult<()> {
-        let Some(ast::Expr::Call(call)) = def.body.block.first() else { unreachable!() };
+        let Some(ast::Expr::Call(call)) = def.body.block.first() else {
+            unreachable!()
+        };
         let Some(ast::Expr::Literal(mod_name)) = call.args.get_left_or_key("Path") else {
             return Ok(());
         };
@@ -974,7 +976,9 @@ impl Context {
                 params: vec![arg],
             }
         };
-        let Some(ident) = def.sig.ident() else { return res };
+        let Some(ident) = def.sig.ident() else {
+            return res;
+        };
         let Some((_, vi)) = self.get_var_info(ident.inspect()) else {
             return res;
         };
@@ -1453,7 +1457,13 @@ impl Context {
                         2,
                         self.level,
                     );
-                    let Some(TypeObj::Builtin{ t: Type::Record(req), .. }) = gen.base_or_sup() else { todo!("{gen}") };
+                    let Some(TypeObj::Builtin {
+                        t: Type::Record(req),
+                        ..
+                    }) = gen.base_or_sup()
+                    else {
+                        todo!("{gen}")
+                    };
                     self.register_instance_attrs(&mut ctx, req)?;
                     self.register_gen_mono_type(ident, gen, ctx, Const)
                 } else {
@@ -1509,7 +1519,9 @@ impl Context {
             }
             GenTypeObj::Patch(_) => {
                 if gen.typ().is_monomorphic() {
-                    let Some(TypeObj::Builtin{ t: base, .. }) = gen.base_or_sup() else { todo!("{gen}") };
+                    let Some(TypeObj::Builtin { t: base, .. }) = gen.base_or_sup() else {
+                        todo!("{gen}")
+                    };
                     let ctx = Self::mono_patch(
                         gen.typ().qual_name(),
                         base.clone(),
@@ -1829,7 +1841,11 @@ impl Context {
         mod_name: &Literal,
     ) -> CompileResult<PathBuf> {
         let ValueObj::Str(__name__) = &mod_name.value else {
-            let name = if kind.is_erg_import() { "import" } else { "pyimport" };
+            let name = if kind.is_erg_import() {
+                "import"
+            } else {
+                "pyimport"
+            };
             return Err(TyCheckErrors::from(TyCheckError::type_mismatch_error(
                 self.cfg.input.clone(),
                 line!() as usize,

crates/erg_compiler/context/unify.rs

@@ -1129,7 +1129,9 @@ impl<'c, 'l, 'u, L: Locational> Unifier<'c, 'l, 'u, L> {
                 self.sub_unify(&sub_subr.return_t, &sup_subr.return_t)?;
             }
             (Quantified(sub_subr), Subr(sup_subr)) => {
-                let Ok(sub_subr) = <&SubrType>::try_from(sub_subr.as_ref()) else { unreachable!() };
+                let Ok(sub_subr) = <&SubrType>::try_from(sub_subr.as_ref()) else {
+                    unreachable!()
+                };
                 sub_subr
                     .non_default_params
                     .iter()
@@ -1164,7 +1166,9 @@ impl<'c, 'l, 'u, L: Locational> Unifier<'c, 'l, 'u, L> {
                 }
             }
             (Subr(sub_subr), Quantified(sup_subr)) => {
-                let Ok(sup_subr) = <&SubrType>::try_from(sup_subr.as_ref()) else { unreachable!() };
+                let Ok(sup_subr) = <&SubrType>::try_from(sup_subr.as_ref()) else {
+                    unreachable!()
+                };
                 sub_subr
                     .non_default_params
                     .iter()
@@ -1447,7 +1451,6 @@ impl<'c, 'l, 'u, L: Locational> Unifier<'c, 'l, 'u, L> {
             (Type::Refinement(lhs), Type::Refinement(rhs)) => {
                 if let Some(_union) = self.unify(&lhs.t, &rhs.t) {
                     return Some(self.ctx.union_refinement(lhs, rhs).into());
-                } else {
                 }
             }
             _ => {}

crates/erg_compiler/link_ast.rs

@@ -137,7 +137,7 @@ impl ASTLinker {
                             decl.expr.loc(),
                             "".into(),
                             "".into(),
-                            None
+                            None,
                         ));
                         continue;
                     };

crates/erg_compiler/lint.rs

@@ -205,7 +205,9 @@ impl ASTLowerer {
         match chunk {
             Expr::Lit(lit) if lit.is_doc_comment() => {
                 let first_line = lit.ln_begin().unwrap_or(1);
-                let ValueObj::Str(content) = &lit.value else { return; };
+                let ValueObj::Str(content) = &lit.value else {
+                    return;
+                };
                 if content.starts_with("erg\n") {
                     let code = content.trim_start_matches("erg\n");
                     let indent = code.chars().take_while(|c| c.is_whitespace()).count();

crates/erg_compiler/lower.rs

@@ -1754,7 +1754,11 @@ impl ASTLowerer {
                 &class,
             )));
         };
-        let Some(class_type) = self.module.context.rec_get_const_obj(hir_def.sig.ident().inspect()) else {
+        let Some(class_type) = self
+            .module
+            .context
+            .rec_get_const_obj(hir_def.sig.ident().inspect())
+        else {
             return unreachable_error!(LowerErrors, LowerError, self);
         };
         let ValueObj::Type(TypeObj::Generated(type_obj)) = class_type else {
@@ -1766,7 +1770,10 @@ impl ASTLowerer {
         if let Some(sup_type) = call.args.get_left_or_key("Super") {
             Self::check_inheritable(&self.cfg, &mut self.errs, type_obj, sup_type, &hir_def.sig);
         }
-        let Some(__new__) = class_ctx.get_current_scope_var(&VarName::from_static("__new__")).or(class_ctx.get_current_scope_var(&VarName::from_static("__call__"))) else {
+        let Some(__new__) = class_ctx
+            .get_current_scope_var(&VarName::from_static("__new__"))
+            .or(class_ctx.get_current_scope_var(&VarName::from_static("__call__")))
+        else {
             return unreachable_error!(LowerErrors, LowerError, self);
         };
         let need_to_gen_new = class_ctx
@@ -2180,13 +2187,10 @@ impl ASTLowerer {
 
     fn check_collision_and_push(&mut self, class: Type, impl_trait: Option<Type>) {
         let methods = self.module.context.pop();
-        let Some((_, class_root)) = self
+        let Some((_, class_root)) = self.module.context.get_mut_nominal_type_ctx(&class) else {
-            .module
+            log!(err "{class} not found");
-            .context
+            return;
-            .get_mut_nominal_type_ctx(&class) else {
+        };
-                log!(err "{class} not found");
-                return;
-            };
         for (newly_defined_name, vi) in methods.locals.clone().into_iter() {
             for (_, already_defined_methods) in class_root.methods_list.iter_mut() {
                 // TODO: 特殊化なら同じ名前でもOK
@@ -2222,7 +2226,9 @@ impl ASTLowerer {
 
     fn push_patch(&mut self) {
         let methods = self.module.context.pop();
-        let ContextKind::PatchMethodDefs(base) = &methods.kind else { unreachable!() };
+        let ContextKind::PatchMethodDefs(base) = &methods.kind else {
+            unreachable!()
+        };
         let patch_name = *methods.name.split_with(&["::", "."]).last().unwrap();
         let patch_root = self
             .module

crates/erg_compiler/module/promise.rs

@@ -130,7 +130,7 @@ impl SharedPromises {
     }
 
     fn join_checked(&self, path: &Path, promise: Promise) -> std::thread::Result<()> {
-        let Promise::Running{ handle, parent } = promise else {
+        let Promise::Running { handle, parent } = promise else {
             return Ok(());
         };
         if self.graph.ancestors(path).contains(&self.path) || handle.thread().id() == current().id()

crates/erg_compiler/transpile.rs

@@ -667,7 +667,9 @@ impl PyScriptGenerator {
             Some("for" | "for!") => {
                 let mut code = "for ".to_string();
                 let iter = call.args.remove(0);
-                let Expr::Lambda(block) = call.args.remove(0) else { todo!() };
+                let Expr::Lambda(block) = call.args.remove(0) else {
+                    todo!()
+                };
                 let non_default = block.params.non_defaults.get(0).unwrap();
                 let param = match &non_default.raw.pat {
                     ParamPattern::VarName(name) => name.token(),
@@ -682,7 +684,9 @@ impl PyScriptGenerator {
             Some("while" | "while!") => {
                 let mut code = "while ".to_string();
                 let cond = call.args.remove(0);
-                let Expr::Lambda(block) = call.args.remove(0) else { todo!() };
+                let Expr::Lambda(block) = call.args.remove(0) else {
+                    todo!()
+                };
                 code += &format!("{}:\n", self.transpile_expr(cond));
                 code += &self.transpile_block(block.body, Discard);
                 code
@@ -694,7 +698,9 @@ impl PyScriptGenerator {
 
     fn transpile_if(&mut self, mut call: Call) -> String {
         let cond = self.transpile_expr(call.args.remove(0));
-        let Expr::Lambda(mut then_block) = call.args.remove(0) else { todo!() };
+        let Expr::Lambda(mut then_block) = call.args.remove(0) else {
+            todo!()
+        };
         let else_block = call.args.try_remove(0).map(|ex| {
             if let Expr::Lambda(blk) = ex {
                 blk

crates/erg_compiler/ty/codeobj.rs

@@ -39,7 +39,7 @@ pub fn consts_into_bytes(consts: Vec<ValueObj>, python_ver: PythonVersion) -> Ve
 
 pub fn jump_abs_addr(minor_ver: u8, op: u8, idx: usize, arg: usize) -> usize {
     match minor_ver {
-        7 | 8 | 9 => jump_abs_addr_309(Opcode309::from(op), idx, arg),
+        7..=9 => jump_abs_addr_309(Opcode309::from(op), idx, arg),
         10 => jump_abs_addr_310(Opcode310::from(op), idx, arg),
         11 => jump_abs_addr_311(Opcode311::from(op), idx, arg),
         n => todo!("unsupported version: {n}"),

crates/erg_compiler/ty/free.rs

@@ -1107,7 +1107,9 @@ mod tests {
     fn cmp_freevar() {
         enable_overflow_stacktrace!();
         let t = named_uninit_var("T".into());
-        let Type::FreeVar(fv) = t.clone() else { unreachable!() };
+        let Type::FreeVar(fv) = t.clone() else {
+            unreachable!()
+        };
         let constraint = Constraint::new_subtype_of(poly("Add", vec![ty_tp(t.clone())]));
         fv.update_constraint(constraint.clone(), true);
         let u = named_free_var("T".into(), 1, constraint);

crates/erg_compiler/ty/mod.rs

@@ -558,7 +558,7 @@ impl SubrType {
     pub fn param_names(&self) -> impl Iterator<Item = &str> + Clone {
         self.non_default_params
             .iter()
-            .chain(self.var_params.as_deref().into_iter())
+            .chain(self.var_params.as_deref())
             .chain(self.default_params.iter())
             .map(|pt| pt.name().map_or("_", |s| &s[..]))
     }
@@ -1371,14 +1371,9 @@ impl HasType for Type {
                 .default_params
                 .iter()
                 .map(|pt| pt.typ().clone())
-                .chain(
+                .chain(sub.var_params.as_deref().map(|pt| pt.typ().clone()))
-                    sub.var_params
-                        .as_deref()
-                        .map(|pt| pt.typ().clone())
-                        .into_iter(),
-                )
                 .chain(sub.non_default_params.iter().map(|pt| pt.typ().clone()))
-                .chain([*sub.return_t.clone()].into_iter())
+                .chain([*sub.return_t.clone()])
                 .collect(),
             Self::Callable { param_ts, .. } => param_ts.clone(),
             Self::Poly { params, .. } => params.iter().filter_map(get_t_from_tp).collect(),

crates/erg_parser/convert.rs

@@ -142,7 +142,11 @@ impl Parser {
 
     fn convert_def_to_var_record_attr(&mut self, mut attr: Def) -> ParseResult<VarRecordAttr> {
         debug_call_info!(self);
-        let Signature::Var(VarSignature{ pat: VarPattern::Ident(lhs), .. }) = attr.sig else {
+        let Signature::Var(VarSignature {
+            pat: VarPattern::Ident(lhs),
+            ..
+        }) = attr.sig
+        else {
             let err = ParseError::simple_syntax_error(line!() as usize, attr.sig.loc());
             self.errs.push(err);
             return Err(());
@@ -293,7 +297,11 @@ impl Parser {
                 let sig = self
                     .convert_rhs_to_sig(*t_app.obj)
                     .map_err(|_| self.stack_dec(fn_name!()))?;
-                let Signature::Var(VarSignature { pat: VarPattern::Ident(ident), .. }) = sig else {
+                let Signature::Var(VarSignature {
+                    pat: VarPattern::Ident(ident),
+                    ..
+                }) = sig
+                else {
                     let err = ParseError::simple_syntax_error(line!() as usize, sig.loc());
                     self.errs.push(err);
                     debug_exit_info!(self);
@@ -343,7 +351,11 @@ impl Parser {
                 let lhs = self
                     .convert_rhs_to_sig(*tasc.expr)
                     .map_err(|_| self.stack_dec(fn_name!()))?;
-                let Signature::Var(VarSignature{ pat: VarPattern::Ident(lhs), .. }) = lhs else {
+                let Signature::Var(VarSignature {
+                    pat: VarPattern::Ident(lhs),
+                    ..
+                }) = lhs
+                else {
                     let err = ParseError::simple_syntax_error(line!() as usize, lhs.loc());
                     self.errs.push(err);
                     return Err(());
@@ -541,7 +553,11 @@ impl Parser {
     }
 
     fn convert_def_to_param_record_attr(&mut self, mut attr: Def) -> ParseResult<ParamRecordAttr> {
-        let Signature::Var(VarSignature{ pat: VarPattern::Ident(lhs), .. }) = attr.sig else {
+        let Signature::Var(VarSignature {
+            pat: VarPattern::Ident(lhs),
+            ..
+        }) = attr.sig
+        else {
             let err = ParseError::simple_syntax_error(line!() as usize, attr.sig.loc());
             self.errs.push(err);
             debug_exit_info!(self);

crates/erg_parser/desugar.rs

@@ -149,7 +149,9 @@ impl Desugarer {
             },
             Expr::DataPack(pack) => {
                 let class = desugar(*pack.class);
-                let Expr::Record(args) = desugar(Expr::Record(pack.args)) else { unreachable!() };
+                let Expr::Record(args) = desugar(Expr::Record(pack.args)) else {
+                    unreachable!()
+                };
                 Expr::DataPack(DataPack::new(class, pack.connector, args))
             }
             Expr::Array(array) => match array {
@@ -273,7 +275,9 @@ impl Desugarer {
                 Expr::Def(Def::new(def.sig, body))
             }
             Expr::ClassDef(class_def) => {
-                let Expr::Def(def) = desugar(Expr::Def(class_def.def)) else { unreachable!() };
+                let Expr::Def(def) = desugar(Expr::Def(class_def.def)) else {
+                    unreachable!()
+                };
                 let methods = class_def
                     .methods_list
                     .into_iter()
@@ -282,7 +286,9 @@ impl Desugarer {
                 Expr::ClassDef(ClassDef::new(def, methods))
             }
             Expr::PatchDef(class_def) => {
-                let Expr::Def(def) = desugar(Expr::Def(class_def.def)) else { unreachable!() };
+                let Expr::Def(def) = desugar(Expr::Def(class_def.def)) else {
+                    unreachable!()
+                };
                 let methods = class_def
                     .methods_list
                     .into_iter()
@@ -401,7 +407,9 @@ impl Desugarer {
                     if let Some(Expr::Def(previous)) = new.last() {
                         if previous.is_subr() && previous.sig.name_as_str() == def.sig.name_as_str()
                         {
-                            let Some(Expr::Def(previous)) = new.pop() else { unreachable!() };
+                            let Some(Expr::Def(previous)) = new.pop() else {
+                                unreachable!()
+                            };
                             let name = def.sig.ident().unwrap().clone();
                             let id = def.body.id;
                             let op = def.body.op.clone();
@@ -479,8 +487,12 @@ impl Desugarer {
 
     fn add_arg_to_match_call(&self, mut previous: Def, def: Def) -> (Call, Option<TypeSpecWithOp>) {
         let op = Token::from_str(TokenKind::FuncArrow, "->");
-        let Expr::Call(mut call) = previous.body.block.remove(0) else { unreachable!() };
+        let Expr::Call(mut call) = previous.body.block.remove(0) else {
-        let Signature::Subr(sig) = def.sig else { unreachable!() };
+            unreachable!()
+        };
+        let Signature::Subr(sig) = def.sig else {
+            unreachable!()
+        };
         let return_t_spec = sig.return_t_spec;
         let first_arg = sig.params.non_defaults.first().unwrap();
         // 最後の定義の引数名を関数全体の引数名にする
@@ -509,7 +521,9 @@ impl Desugarer {
     // TODO: procedural match
     fn gen_match_call(&self, previous: Def, def: Def) -> (Call, Option<TypeSpecWithOp>) {
         let op = Token::from_str(TokenKind::FuncArrow, "->");
-        let Signature::Subr(prev_sig) = previous.sig else { unreachable!() };
+        let Signature::Subr(prev_sig) = previous.sig else {
+            unreachable!()
+        };
         let params_len = prev_sig.params.len();
         let params = if params_len == 1 {
             prev_sig.params
@@ -520,7 +534,9 @@ impl Desugarer {
         let match_symbol = Expr::static_local("match");
         let sig = LambdaSignature::new(params, prev_sig.return_t_spec, prev_sig.bounds);
         let first_branch = Lambda::new(sig, op.clone(), previous.body.block, previous.body.id);
-        let Signature::Subr(sig) = def.sig else { unreachable!() };
+        let Signature::Subr(sig) = def.sig else {
+            unreachable!()
+        };
         let params = if sig.params.len() == 1 {
             sig.params
         } else {
@@ -588,10 +604,13 @@ impl Desugarer {
     }
 
     fn desugar_pattern_in_module(&mut self, module: Module) -> Module {
+        // https://github.com/rust-lang/rust-clippy/issues/11300
+        #[allow(clippy::useless_conversion)]
         Module::new(self.desugar_pattern(module.into_iter()))
     }
 
     fn desugar_pattern_in_block(&mut self, block: Block) -> Block {
+        #[allow(clippy::useless_conversion)]
         Block::new(self.desugar_pattern(block.into_iter()))
     }
 

crates/erg_parser/parse.rs

@@ -3470,18 +3470,26 @@ impl Parser {
                 .try_reduce_call_or_acc(false)
                 .map_err(|_| self.stack_dec(fn_name!()))?;
             let Expr::Call(mut call) = expect_call else {
-                    let caused_by = caused_by!();
+                let caused_by = caused_by!();
-                    log!(err "error caused by: {caused_by}");
+                log!(err "error caused by: {caused_by}");
-                let err = self.get_stream_op_syntax_error(line!() as usize, expect_call.loc(), caused_by!());
+                let err = self.get_stream_op_syntax_error(
+                    line!() as usize,
+                    expect_call.loc(),
+                    caused_by!(),
+                );
                 self.errs.push(err);
                 debug_exit_info!(self);
                 return Err(());
             };
             let ExprOrOp::Expr(first_arg) = stack.pop().unwrap() else {
-                    let caused_by = caused_by!();
+                let caused_by = caused_by!();
-                    log!(err "error caused by: {caused_by}");
+                log!(err "error caused by: {caused_by}");
-                self.errs
+                self.errs.push(ParseError::compiler_bug(
-                    .push(ParseError::compiler_bug(line!() as usize, call.loc(), fn_name!(), line!()));
+                    line!() as usize,
+                    call.loc(),
+                    fn_name!(),
+                    line!(),
+                ));
                 debug_exit_info!(self);
                 return Err(());
             };