Fix suggestion span

Author: trevyn

compiler/rustc_parse/src/parser/diagnostics.rs

@@ -621,7 +621,7 @@ impl<'a> Parser<'a> {
         }
 
         // Possible missing `struct` or `enum` keyword
-        if let TokenKind::Ident(symbol, _) = &self.prev_token.kind
+        if let TokenKind::Ident(_, _) = self.prev_token.kind
             && let TokenKind::OpenDelim(Delimiter::Brace) = self.token.kind
             && let [TokenType::Token(token::Not), TokenType::Token(token::PathSep)] = expected[..]
         {
@@ -637,9 +637,9 @@ impl<'a> Parser<'a> {
                         ("an", "enum")
                     };
                     err.span_suggestion(
-                        self.prev_token.span,
+                        self.prev_token.span.shrink_to_lo(),
                         format!("if this is {article} {kw} definition, use the `{kw}` keyword"),
-                        format!("{kw} {symbol}"),
+                        format!("{kw} "),
                         Applicability::MaybeIncorrect,
                     );
                     break;
@@ -648,7 +648,7 @@ impl<'a> Parser<'a> {
         }
 
         // Possible missing `fn` keyword
-        if let TokenKind::Ident(symbol, _) = &self.prev_token.kind
+        if let TokenKind::Ident(_, _) = self.prev_token.kind
             && let TokenKind::OpenDelim(Delimiter::Parenthesis) = self.token.kind
         {
             let mut lookahead = self.clone();
@@ -659,9 +659,9 @@ impl<'a> Parser<'a> {
                 }
                 if lookahead.token == token::OpenDelim(Delimiter::Brace) {
                     err.span_suggestion(
-                        self.prev_token.span,
+                        self.prev_token.span.shrink_to_lo(),
                         "if this is a function definition, use the `fn` keyword",
-                        format!("fn {symbol}"),
+                        "fn ",
                         Applicability::MaybeIncorrect,
                     );
                     break;

tests/ui/did_you_mean/issue-40006.stderr

@@ -25,7 +25,7 @@ LL | }
 help: if this is a function definition, use the `fn` keyword
    |
 LL |     fn X() {}
-   |     ~~~~
+   |     ++
 
 error: expected one of `!` or `::`, found `(`
   --> $DIR/issue-40006.rs:16:6
@@ -40,7 +40,7 @@ LL | }
 help: if this is a function definition, use the `fn` keyword
    |
 LL |     fn X() {}
-   |     ~~~~
+   |     ++
 
 error: expected one of `!` or `[`, found `#`
   --> $DIR/issue-40006.rs:19:17

tests/ui/parser/missing-enum-issue-125446.stderr

@@ -7,7 +7,7 @@ LL | Whoops {
 help: if this is an enum definition, use the `enum` keyword
    |
 LL | enum Whoops {
-   | ~~~~~~~~~~~
+   | ++++
 
 error: aborting due to 1 previous error
 

tests/ui/parser/missing-fn-issue-125446.stderr

@@ -7,7 +7,7 @@ LL | whoops() {}
 help: if this is a function definition, use the `fn` keyword
    |
 LL | fn whoops() {}
-   | ~~~~~~~~~
+   | ++
 
 error: aborting due to 1 previous error
 

tests/ui/parser/missing-fn-issue-65381-1.stderr

@@ -7,7 +7,7 @@ LL | main() {
 help: if this is a function definition, use the `fn` keyword
    |
 LL | fn main() {
-   | ~~~~~~~
+   | ++
 
 error: aborting due to 1 previous error
 

tests/ui/parser/missing-fn-issue-65381-3.stderr

@@ -7,7 +7,7 @@ LL | pub const initial_value() -> Self {
 help: if this is a function definition, use the `fn` keyword
    |
 LL | pub const fn initial_value() -> Self {
-   |           ~~~~~~~~~~~~~~~~
+   |           ++
 
 error: missing type for `const` item
   --> $DIR/missing-fn-issue-65381-3.rs:1:24

tests/ui/parser/missing-struct-issue-125446-1.stderr

@@ -7,7 +7,7 @@ LL | Whoops {
 help: if this is a struct definition, use the `struct` keyword
    |
 LL | struct Whoops {
-   | ~~~~~~~~~~~~~
+   | ++++++
 
 error: aborting due to 1 previous error
 

tests/ui/parser/missing-struct-issue-125446-2.stderr

@@ -7,7 +7,7 @@ LL | Whoops {}
 help: if this is a struct definition, use the `struct` keyword
    |
 LL | struct Whoops {}
-   | ~~~~~~~~~~~~~
+   | ++++++
 
 error: aborting due to 1 previous error