Fix leading colon

Author: matklad

crates/ra_syntax/src/ast/generated/nodes.rs

@@ -19,10 +19,10 @@ pub struct PathSegment {
     pub(crate) syntax: SyntaxNode,
 }
 impl PathSegment {
-    pub fn coloncolon_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![::]) }
     pub fn crate_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![crate]) }
     pub fn self_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![self]) }
     pub fn super_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![super]) }
+    pub fn coloncolon_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![::]) }
     pub fn name_ref(&self) -> Option<NameRef> { support::child(&self.syntax) }
     pub fn generic_arg_list(&self) -> Option<GenericArgList> { support::child(&self.syntax) }
     pub fn param_list(&self) -> Option<ParamList> { support::child(&self.syntax) }

xtask/src/codegen/rust.ungram

@@ -2,7 +2,8 @@ Path =
   (qualifier:Path '::')? segment:PathSegment
 
 PathSegment =
-  '::' | 'crate' | 'self' | 'super'
+  'crate' | 'self' | 'super'
+| '::' NameRef
 | NameRef GenericArgList?
 | NameRef ParamList RetType?
 | '<' PathType ('as' PathType)? '>'