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Move mismatched-arg-count diagnostic to inference

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This commit is contained in:
Florian Diebold 2022-03-27 19:10:31 +02:00
parent 837901a4a6
commit 2be7e26d7d
4 changed files with 67 additions and 83 deletions
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62
crates/hir_ty/src/infer/expr.rs
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@ -296,13 +296,18 @@ impl<'a> InferenceContext<'a> {
break;
}
}
// if the function is unresolved, we use is_varargs=true to
// suppress the arg count diagnostic here
let is_varargs =
derefed_callee.callable_sig(self.db).map_or(false, |sig| sig.is_varargs)
|| res.is_none();
let (param_tys, ret_ty) = match res {
Some(res) => {
let adjustments = auto_deref_adjust_steps(&derefs);
self.write_expr_adj(*callee, adjustments);
res
}
None => (Vec::new(), self.err_ty()),
None => (Vec::new(), self.err_ty()), // FIXME diagnostic
};
let indices_to_skip = self.check_legacy_const_generics(derefed_callee, args);
self.register_obligations_for_call(&callee_ty);
@ -313,7 +318,14 @@ impl<'a> InferenceContext<'a> {
param_tys.clone(),
);
self.check_call_arguments(args, &expected_inputs, &param_tys, &indices_to_skip);
self.check_call_arguments(
tgt_expr,
args,
&expected_inputs,
&param_tys,
&indices_to_skip,
is_varargs,
);
self.normalize_associated_types_in(ret_ty)
}
Expr::MethodCall { receiver, args, method_name, generic_args } => self
@ -948,22 +960,28 @@ impl<'a> InferenceContext<'a> {
};
let method_ty = method_ty.substitute(Interner, &substs);
self.register_obligations_for_call(&method_ty);
let (formal_receiver_ty, param_tys, ret_ty) = match method_ty.callable_sig(self.db) {
Some(sig) => {
if !sig.params().is_empty() {
(sig.params()[0].clone(), sig.params()[1..].to_vec(), sig.ret().clone())
} else {
(self.err_ty(), Vec::new(), sig.ret().clone())
let (formal_receiver_ty, param_tys, ret_ty, is_varargs) =
match method_ty.callable_sig(self.db) {
Some(sig) => {
if !sig.params().is_empty() {
(
sig.params()[0].clone(),
sig.params()[1..].to_vec(),
sig.ret().clone(),
sig.is_varargs,
)
} else {
(self.err_ty(), Vec::new(), sig.ret().clone(), sig.is_varargs)
}
}
}
None => (self.err_ty(), Vec::new(), self.err_ty()),
};
None => (self.err_ty(), Vec::new(), self.err_ty(), true),
};
self.unify(&formal_receiver_ty, &receiver_ty);
let expected_inputs =
self.expected_inputs_for_expected_output(expected, ret_ty.clone(), param_tys.clone());
self.check_call_arguments(args, &expected_inputs, &param_tys, &[]);
self.check_call_arguments(tgt_expr, args, &expected_inputs, &param_tys, &[], is_varargs);
self.normalize_associated_types_in(ret_ty)
}
@ -996,11 +1014,21 @@ impl<'a> InferenceContext<'a> {
fn check_call_arguments(
&mut self,
expr: ExprId,
args: &[ExprId],
expected_inputs: &[Ty],
param_tys: &[Ty],
skip_indices: &[u32],
is_varargs: bool,
) {
if args.len() != param_tys.len() + skip_indices.len() && !is_varargs {
self.push_diagnostic(InferenceDiagnostic::MismatchedArgCount {
call_expr: expr,
expected: param_tys.len() + skip_indices.len(),
found: args.len(),
});
}
// Quoting https://github.com/rust-lang/rust/blob/6ef275e6c3cb1384ec78128eceeb4963ff788dca/src/librustc_typeck/check/mod.rs#L3325 --
// We do this in a pretty awful way: first we type-check any arguments
// that are not closures, then we type-check the closures. This is so
@ -1188,7 +1216,15 @@ impl<'a> InferenceContext<'a> {
// only use legacy const generics if the param count matches with them
if data.params.len() + data.legacy_const_generics_indices.len() != args.len() {
return Vec::new();
if args.len() <= data.params.len() {
return Vec::new();
} else {
// there are more parameters than there should be without legacy
// const params; use them
let mut indices = data.legacy_const_generics_indices.clone();
indices.sort();
return indices;
}
}
// check legacy const parameters