Fix completion in when typing integer.|

It should show integer, not floating point methods.

crates/hir/src/lib.rs

@@ -3043,10 +3043,17 @@ pub struct BuiltinType {
 }
 
 impl BuiltinType {
+    // Constructors are added on demand, feel free to add more.
     pub fn str() -> BuiltinType {
         BuiltinType { inner: hir_def::builtin_type::BuiltinType::Str }
     }
 
+    pub fn i32() -> BuiltinType {
+        BuiltinType {
+            inner: hir_def::builtin_type::BuiltinType::Int(hir_ty::primitive::BuiltinInt::I32),
+        }
+    }
+
     pub fn ty<'db>(self, db: &'db dyn HirDatabase) -> Type<'db> {
         let core = Crate::core(db).map(|core| core.id).unwrap_or_else(|| db.all_crates()[0]);
         Type::new_for_crate(core, TyBuilder::builtin(self.inner))

crates/ide-completion/src/context/analysis.rs

@@ -4,6 +4,7 @@ use std::iter;
 use hir::{ExpandResult, InFile, Semantics, Type, TypeInfo, Variant};
 use ide_db::{RootDatabase, active_parameter::ActiveParameter};
 use itertools::Either;
+use stdx::always;
 use syntax::{
     AstNode, AstToken, Direction, NodeOrToken, SyntaxElement, SyntaxKind, SyntaxNode, SyntaxToken,
     T, TextRange, TextSize,
@@ -869,8 +870,15 @@ fn classify_name_ref<'db>(
                     return None;
                 }
 
+                let mut receiver_ty = receiver.as_ref().and_then(|it| sema.type_of_expr(it));
+                if receiver_is_ambiguous_float_literal {
+                    // `123.|` is parsed as a float but should actually be an integer.
+                    always!(receiver_ty.as_ref().is_none_or(|receiver_ty| receiver_ty.original.is_float()));
+                    receiver_ty = Some(TypeInfo { original: hir::BuiltinType::i32().ty(sema.db), adjusted: None });
+                }
+
                 let kind = NameRefKind::DotAccess(DotAccess {
-                    receiver_ty: receiver.as_ref().and_then(|it| sema.type_of_expr(it)),
+                    receiver_ty,
                     kind: DotAccessKind::Field { receiver_is_ambiguous_float_literal },
                     receiver,
                     ctx: DotAccessExprCtx { in_block_expr: is_in_block(field.syntax()), in_breakable: is_in_breakable(field.syntax()) }

crates/ide-completion/src/tests/expression.rs

@@ -2241,3 +2241,37 @@ fn main() {
     "#,
     );
 }
+
+#[test]
+fn ambiguous_float_literal() {
+    check(
+        r#"
+#![rustc_coherence_is_core]
+
+impl i32 {
+    pub fn int_method(self) {}
+}
+impl f64 {
+    pub fn float_method(self) {}
+}
+
+fn foo() {
+    1.$0
+}
+    "#,
+        expect![[r#"
+            me int_method() fn(self)
+            sn box    Box::new(expr)
+            sn call   function(expr)
+            sn const        const {}
+            sn dbg        dbg!(expr)
+            sn dbgr      dbg!(&expr)
+            sn deref           *expr
+            sn match   match expr {}
+            sn ref             &expr
+            sn refm        &mut expr
+            sn return    return expr
+            sn unsafe      unsafe {}
+        "#]],
+    );
+}