Rollup merge of #97240 - TaKO8Ki:improve-errors-about-typos-on-variables, r=compiler-errors

Typo suggestion for a variable with a name similar to struct fields

closes #97133

Author: JohnTitor

compiler/rustc_resolve/src/late/diagnostics.rs

@@ -445,6 +445,8 @@ impl<'a: 'ast, 'ast> LateResolutionVisitor<'a, '_, 'ast> {
                 );
             }
         }
+        // Try Levenshtein algorithm.
+        let typo_sugg = self.lookup_typo_candidate(path, ns, is_expected);
         if path.len() == 1 && self.self_type_is_available() {
             if let Some(candidate) = self.lookup_assoc_candidate(ident, ns, is_expected) {
                 let self_is_available = self.self_value_is_available(path[0].ident.span);
@@ -454,7 +456,7 @@ impl<'a: 'ast, 'ast> LateResolutionVisitor<'a, '_, 'ast> {
                             err.span_suggestion(
                                 span,
                                 "you might have meant to use the available field",
-                                format!("self.{}", path_str),
+                                format!("self.{path_str}"),
                                 Applicability::MachineApplicable,
                             );
                         } else {
@@ -465,7 +467,7 @@ impl<'a: 'ast, 'ast> LateResolutionVisitor<'a, '_, 'ast> {
                         err.span_suggestion(
                             span,
                             "you might have meant to call the method",
-                            format!("self.{}", path_str),
+                            format!("self.{path_str}"),
                             Applicability::MachineApplicable,
                         );
                     }
@@ -476,11 +478,12 @@ impl<'a: 'ast, 'ast> LateResolutionVisitor<'a, '_, 'ast> {
                         err.span_suggestion(
                             span,
                             &format!("you might have meant to {}", candidate.action()),
-                            format!("Self::{}", path_str),
+                            format!("Self::{path_str}"),
                             Applicability::MachineApplicable,
                         );
                     }
                 }
+                self.r.add_typo_suggestion(&mut err, typo_sugg, ident_span);
                 return (err, candidates);
             }
 
@@ -495,16 +498,14 @@ impl<'a: 'ast, 'ast> LateResolutionVisitor<'a, '_, 'ast> {
 
                 err.span_suggestion(
                     call_span,
-                    &format!("try calling `{}` as a method", ident),
-                    format!("self.{}({})", path_str, args_snippet),
+                    &format!("try calling `{ident}` as a method"),
+                    format!("self.{path_str}({args_snippet})"),
                     Applicability::MachineApplicable,
                 );
                 return (err, candidates);
             }
         }
 
-        // Try Levenshtein algorithm.
-        let typo_sugg = self.lookup_typo_candidate(path, ns, is_expected);
         // Try context-dependent help if relaxed lookup didn't work.
         if let Some(res) = res {
             if self.smart_resolve_context_dependent_help(

src/test/ui/resolve/typo-suggestion-for-variable-with-name-similar-to-struct-field.rs

@@ -0,0 +1,46 @@
+struct A {
+    config: String,
+}
+
+impl A {
+    fn new(cofig: String) -> Self {
+        Self { config } //~ Error cannot find value `config` in this scope
+    }
+
+    fn do_something(cofig: String) {
+        println!("{config}"); //~ Error cannot find value `config` in this scope
+    }
+
+    fn self_is_available(self, cofig: String) {
+        println!("{config}"); //~ Error cannot find value `config` in this scope
+    }
+}
+
+trait B {
+    const BAR: u32 = 3;
+    type Baz;
+    fn bar(&self);
+    fn baz(&self) {}
+    fn bah() {}
+}
+
+impl B for Box<isize> {
+    type Baz = String;
+    fn bar(&self) {
+        // let baz = 3;
+        baz();
+        //~^ ERROR cannot find function `baz`
+        bah;
+        //~^ ERROR cannot find value `bah`
+        BAR;
+        //~^ ERROR cannot find value `BAR` in this scope
+        let foo: Baz = "".to_string();
+        //~^ ERROR cannot find type `Baz` in this scope
+    }
+}
+
+fn ba() {}
+const BARR: u32 = 3;
+type Bar = String;
+
+fn main() {}

src/test/ui/resolve/typo-suggestion-for-variable-with-name-similar-to-struct-field.stderr

@@ -0,0 +1,109 @@
+error[E0425]: cannot find value `config` in this scope
+  --> $DIR/typo-suggestion-for-variable-with-name-similar-to-struct-field.rs:7:16
+   |
+LL |         Self { config }
+   |                ^^^^^^
+   |                |
+   |                a field by this name exists in `Self`
+   |                help: a local variable with a similar name exists: `cofig`
+
+error[E0425]: cannot find value `config` in this scope
+  --> $DIR/typo-suggestion-for-variable-with-name-similar-to-struct-field.rs:11:20
+   |
+LL |         println!("{config}");
+   |                    ^^^^^^
+   |                    |
+   |                    a field by this name exists in `Self`
+   |                    help: a local variable with a similar name exists: `cofig`
+
+error[E0425]: cannot find value `config` in this scope
+  --> $DIR/typo-suggestion-for-variable-with-name-similar-to-struct-field.rs:15:20
+   |
+LL |         println!("{config}");
+   |                    ^^^^^^
+   |
+help: you might have meant to use the available field
+   |
+LL |         println!("{self.config}");
+   |                    ~~~~~~~~~~~
+help: a local variable with a similar name exists
+   |
+LL |         println!("{cofig}");
+   |                    ~~~~~
+
+error[E0425]: cannot find function `baz` in this scope
+  --> $DIR/typo-suggestion-for-variable-with-name-similar-to-struct-field.rs:31:9
+   |
+LL |         baz();
+   |         ^^^
+...
+LL | fn ba() {}
+   | ------- similarly named function `ba` defined here
+   |
+help: you might have meant to call the method
+   |
+LL |         self.baz();
+   |         ~~~~~~~~
+help: a function with a similar name exists
+   |
+LL |         ba();
+   |         ~~
+
+error[E0425]: cannot find value `bah` in this scope
+  --> $DIR/typo-suggestion-for-variable-with-name-similar-to-struct-field.rs:33:9
+   |
+LL |         bah;
+   |         ^^^
+...
+LL | fn ba() {}
+   | ------- similarly named function `ba` defined here
+   |
+help: you might have meant to call the associated function
+   |
+LL |         Self::bah;
+   |         ~~~~~~~~~
+help: a function with a similar name exists
+   |
+LL |         ba;
+   |         ~~
+
+error[E0425]: cannot find value `BAR` in this scope
+  --> $DIR/typo-suggestion-for-variable-with-name-similar-to-struct-field.rs:35:9
+   |
+LL |         BAR;
+   |         ^^^
+...
+LL | const BARR: u32 = 3;
+   | -------------------- similarly named constant `BARR` defined here
+   |
+help: you might have meant to use the associated `const`
+   |
+LL |         Self::BAR;
+   |         ~~~~~~~~~
+help: a constant with a similar name exists
+   |
+LL |         BARR;
+   |         ~~~~
+
+error[E0412]: cannot find type `Baz` in this scope
+  --> $DIR/typo-suggestion-for-variable-with-name-similar-to-struct-field.rs:37:18
+   |
+LL |         let foo: Baz = "".to_string();
+   |                  ^^^
+...
+LL | type Bar = String;
+   | ------------------ similarly named type alias `Bar` defined here
+   |
+help: you might have meant to use the associated type
+   |
+LL |         let foo: Self::Baz = "".to_string();
+   |                  ~~~~~~~~~
+help: a type alias with a similar name exists
+   |
+LL |         let foo: Bar = "".to_string();
+   |                  ~~~
+
+error: aborting due to 7 previous errors
+
+Some errors have detailed explanations: E0412, E0425.
+For more information about an error, try `rustc --explain E0412`.