Rollup merge of #130870 - surechen:fix_130791, r=compiler-errors

Add suggestion for removing invalid path sep `::` in fn def

Add suggestion for removing invalid path separator `::` in function definition.

for example: `fn invalid_path_separator::<T>() {}`

fixes #130791

compiler/rustc_parse/messages.ftl

@@ -422,6 +422,9 @@ parse_invalid_meta_item = expected unsuffixed literal, found `{$token}`
 
 parse_invalid_offset_of = offset_of expects dot-separated field and variant names
 
+parse_invalid_path_sep_in_fn_definition = invalid path separator in function definition
+    .suggestion = remove invalid path separator
+
 parse_invalid_unicode_escape = invalid unicode character escape
     .label = invalid escape
     .help = unicode escape must {$surrogate ->

compiler/rustc_parse/src/errors.rs

@@ -1755,6 +1755,14 @@ pub(crate) struct MissingFnParams {
     pub span: Span,
 }
 
+#[derive(Diagnostic)]
+#[diag(parse_invalid_path_sep_in_fn_definition)]
+pub(crate) struct InvalidPathSepInFnDefinition {
+    #[primary_span]
+    #[suggestion(code = "", applicability = "machine-applicable", style = "verbose")]
+    pub span: Span,
+}
+
 #[derive(Diagnostic)]
 #[diag(parse_missing_trait_in_trait_impl)]
 pub(crate) struct MissingTraitInTraitImpl {

compiler/rustc_parse/src/parser/generics.rs

@@ -269,6 +269,13 @@ impl<'a> Parser<'a> {
     ///                  | ( < lifetimes , typaramseq ( , )? > )
     /// where   typaramseq = ( typaram ) | ( typaram , typaramseq )
     pub(super) fn parse_generics(&mut self) -> PResult<'a, ast::Generics> {
+        // invalid path separator `::` in function definition
+        // for example `fn invalid_path_separator::<T>() {}`
+        if self.eat_noexpect(&token::PathSep) {
+            self.dcx()
+                .emit_err(errors::InvalidPathSepInFnDefinition { span: self.prev_token.span });
+        }
+
         let span_lo = self.token.span;
         let (params, span) = if self.eat_lt() {
             let params = self.parse_generic_params()?;