diff --git a/crates/ra_syntax/src/ast/extensions.rs b/crates/ra_syntax/src/ast/extensions.rs
index 1aacb06764..76b7655e68 100644
--- a/crates/ra_syntax/src/ast/extensions.rs
+++ b/crates/ra_syntax/src/ast/extensions.rs
@@ -275,7 +275,7 @@ pub enum SelfParamKind {
 impl ast::SelfParam {
     pub fn kind(&self) -> SelfParamKind {
         if self.amp_token().is_some() {
-            if self.amp_mut_token().is_some() {
+            if self.mut_token().is_some() {
                 SelfParamKind::MutRef
             } else {
                 SelfParamKind::Ref
@@ -284,24 +284,6 @@ impl ast::SelfParam {
             SelfParamKind::Owned
         }
     }
-
-    /// the "mut" in "mut self", not the one in "&mut self"
-    pub fn mut_token(&self) -> Option<SyntaxToken> {
-        self.syntax()
-            .children_with_tokens()
-            .filter_map(|it| it.into_token())
-            .take_while(|it| it.kind() != T![&])
-            .find(|it| it.kind() == T![mut])
-    }
-
-    /// the "mut" in "&mut self", not the one in "mut self"
-    pub fn amp_mut_token(&self) -> Option<SyntaxToken> {
-        self.syntax()
-            .children_with_tokens()
-            .filter_map(|it| it.into_token())
-            .skip_while(|it| it.kind() != T![&])
-            .find(|it| it.kind() == T![mut])
-    }
 }
 
 #[derive(Clone, Debug, PartialEq, Eq, Hash)]
diff --git a/crates/ra_syntax/src/ast/generated/nodes.rs b/crates/ra_syntax/src/ast/generated/nodes.rs
index 0df7cfe526..f1098755b6 100644
--- a/crates/ra_syntax/src/ast/generated/nodes.rs
+++ b/crates/ra_syntax/src/ast/generated/nodes.rs
@@ -2307,6 +2307,7 @@ impl ast::TypeAscriptionOwner for SelfParam {}
 impl ast::AttrsOwner for SelfParam {}
 impl SelfParam {
     pub fn amp_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![&]) }
+    pub fn mut_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![mut]) }
     pub fn lifetime_token(&self) -> Option<SyntaxToken> {
         support::token(&self.syntax, T![lifetime])
     }
diff --git a/xtask/src/ast_src.rs b/xtask/src/ast_src.rs
index 8c0b5f5a8b..69cba91684 100644
--- a/xtask/src/ast_src.rs
+++ b/xtask/src/ast_src.rs
@@ -568,7 +568,7 @@ pub(crate) const AST_SRC: AstSrc = AstSrc {
             params: [Param],
             T![')']
         }
-        struct SelfParam: TypeAscriptionOwner, AttrsOwner { T![&], T![lifetime], T![self] }
+        struct SelfParam: TypeAscriptionOwner, AttrsOwner { T![&], T![mut], T![lifetime], T![self] }
         struct Param: TypeAscriptionOwner, AttrsOwner {
             Pat,
             T![...]