diff options
Diffstat (limited to 'src/libsyntax/fold.rs')
| -rw-r--r-- | src/libsyntax/fold.rs | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/src/libsyntax/fold.rs b/src/libsyntax/fold.rs index 660056e15e0..dff408d2339 100644 --- a/src/libsyntax/fold.rs +++ b/src/libsyntax/fold.rs @@ -118,6 +118,10 @@ pub trait Folder : Sized { noop_fold_arm(a, self) } + fn fold_guard(&mut self, g: Guard) -> Guard { + noop_fold_guard(g, self) + } + fn fold_pat(&mut self, p: P<Pat>) -> P<Pat> { noop_fold_pat(p, self) } @@ -354,11 +358,17 @@ pub fn noop_fold_arm<T: Folder>(Arm {attrs, pats, guard, body}: Arm, Arm { attrs: fold_attrs(attrs, fld), pats: pats.move_map(|x| fld.fold_pat(x)), - guard: guard.map(|x| fld.fold_expr(x)), + guard: guard.map(|x| fld.fold_guard(x)), body: fld.fold_expr(body), } } +pub fn noop_fold_guard<T: Folder>(g: Guard, fld: &mut T) -> Guard { + match g { + Guard::If(e) => Guard::If(fld.fold_expr(e)), + } +} + pub fn noop_fold_ty_binding<T: Folder>(b: TypeBinding, fld: &mut T) -> TypeBinding { TypeBinding { id: fld.new_id(b.id), |