Merge rust-lang#7627

7627: infer: update resolver when descending into block r=jonas-schievink a=jonas-schievink



Co-authored-by: Jonas Schievink <[email protected]>

Author: bors[bot]

crates/hir_ty/src/diagnostics/match_check.rs

@@ -1495,6 +1495,20 @@ fn main(f: Foo) {
         );
     }
 
+    #[test]
+    fn internal_or() {
+        check_diagnostics(
+            r#"
+fn main() {
+    enum Either { A(bool), B }
+    match Either::B {
+        //^^^^^^^^^ Missing match arm
+        Either::A(true | false) => (),
+    }
+}
+"#,
+        );
+    }
     mod false_negatives {
         //! The implementation of match checking here is a work in progress. As we roll this out, we
         //! prefer false negatives to false positives (ideally there would be no false positives). This
@@ -1518,21 +1532,6 @@ fn main() {
         11..20 => (),
     }
 }
-"#,
-            );
-        }
-
-        #[test]
-        fn internal_or() {
-            // We do not currently handle patterns with internal `or`s.
-            check_diagnostics(
-                r#"
-fn main() {
-    enum Either { A(bool), B }
-    match Either::B {
-        Either::A(true | false) => (),
-    }
-}
 "#,
             );
         }

crates/hir_ty/src/infer/expr.rs

@@ -137,24 +137,33 @@ impl<'a> InferenceContext<'a> {
 
                 self.coerce_merge_branch(&then_ty, &else_ty)
             }
-            Expr::Block { statements, tail, label, id: _ } => match label {
-                Some(_) => {
-                    let break_ty = self.table.new_type_var();
-                    self.breakables.push(BreakableContext {
-                        may_break: false,
-                        break_ty: break_ty.clone(),
-                        label: label.map(|label| self.body[label].name.clone()),
-                    });
-                    let ty = self.infer_block(statements, *tail, &Expectation::has_type(break_ty));
-                    let ctxt = self.breakables.pop().expect("breakable stack broken");
-                    if ctxt.may_break {
-                        ctxt.break_ty
-                    } else {
-                        ty
+            Expr::Block { statements, tail, label, id: _ } => {
+                let old_resolver = mem::replace(
+                    &mut self.resolver,
+                    resolver_for_expr(self.db.upcast(), self.owner, tgt_expr),
+                );
+                let ty = match label {
+                    Some(_) => {
+                        let break_ty = self.table.new_type_var();
+                        self.breakables.push(BreakableContext {
+                            may_break: false,
+                            break_ty: break_ty.clone(),
+                            label: label.map(|label| self.body[label].name.clone()),
+                        });
+                        let ty =
+                            self.infer_block(statements, *tail, &Expectation::has_type(break_ty));
+                        let ctxt = self.breakables.pop().expect("breakable stack broken");
+                        if ctxt.may_break {
+                            ctxt.break_ty
+                        } else {
+                            ty
+                        }
                     }
-                }
-                None => self.infer_block(statements, *tail, expected),
-            },
+                    None => self.infer_block(statements, *tail, expected),
+                };
+                self.resolver = old_resolver;
+                ty
+            }
             Expr::Unsafe { body } | Expr::Const { body } => self.infer_expr(*body, expected),
             Expr::TryBlock { body } => {
                 let _inner = self.infer_expr(*body, expected);

crates/hir_ty/src/tests/simple.rs

@@ -2415,3 +2415,50 @@ fn infer_const_params() {
         "#]],
     );
 }
+
+#[test]
+fn infer_inner_type() {
+    check_infer(
+        r#"
+        fn foo() {
+            struct S { field: u32 }
+            let s = S { field: 0 };
+            let f = s.field;
+        }
+    "#,
+        expect![[r#"
+            9..89 '{     ...eld; }': ()
+            47..48 's': S
+            51..65 'S { field: 0 }': S
+            62..63 '0': u32
+            75..76 'f': u32
+            79..80 's': S
+            79..86 's.field': u32
+        "#]],
+    );
+}
+
+#[test]
+fn infer_nested_inner_type() {
+    check_infer(
+        r#"
+        fn foo() {
+            {
+                let s = S { field: 0 };
+                let f = s.field;
+            }
+            struct S { field: u32 }
+        }
+    "#,
+        expect![[r#"
+            9..109 '{     ...32 } }': ()
+            15..79 '{     ...     }': ()
+            29..30 's': S
+            33..47 'S { field: 0 }': S
+            44..45 '0': u32
+            61..62 'f': u32
+            65..66 's': S
+            65..72 's.field': u32
+        "#]],
+    );
+}

crates/hir_ty/src/tests/traits.rs

@@ -3151,3 +3151,54 @@ fn test() {
     "#,
     );
 }
+
+#[test]
+fn inner_use() {
+    check_types(
+        r#"
+mod m {
+    pub trait Tr {
+        fn method(&self) -> u8 { 0 }
+    }
+
+    impl Tr for () {}
+}
+
+fn f() {
+    use m::Tr;
+
+    ().method();
+  //^^^^^^^^^^^ u8
+}
+        "#,
+    );
+}
+
+#[test]
+fn inner_use_in_block() {
+    check_types(
+        r#"
+mod m {
+    pub trait Tr {
+        fn method(&self) -> u8 { 0 }
+    }
+
+    impl Tr for () {}
+}
+
+fn f() {
+    {
+        use m::Tr;
+
+        ().method();
+      //^^^^^^^^^^^ u8
+    }
+
+    {
+        ().method();
+      //^^^^^^^^^^^ {unknown}
+    }
+}
+        "#,
+    );
+}

crates/ide/src/inlay_hints.rs

@@ -654,6 +654,7 @@ fn main() {
     let test = "test";
       //^^^^ &str
     let test = InnerStruct {};
+      //^^^^ InnerStruct
 
     let test = unresolved();