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Introduce if-let guards in the HIR

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This commit is contained in:
LeSeulArtichaut 2020-10-24 21:13:54 +02:00
parent a68864b688
commit 77d80b22f1
6 changed files with 24 additions and 15 deletions
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1
compiler/rustc_hir/src/hir.rs
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@ -1160,6 +1160,7 @@ pub struct Arm<'hir> {
#[derive(Debug, HashStable_Generic)]
pub enum Guard<'hir> {
If(&'hir Expr<'hir>),
IfLet(&'hir Pat<'hir>, &'hir Expr<'hir>),
}
#[derive(Debug, HashStable_Generic)]

4
compiler/rustc_hir/src/intravisit.rs
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@ -1228,6 +1228,10 @@ pub fn walk_arm<'v, V: Visitor<'v>>(visitor: &mut V, arm: &'v Arm<'v>) {
if let Some(ref g) = arm.guard {
match g {
Guard::If(ref e) => visitor.visit_expr(e),
Guard::IfLet(ref pat, ref e) => {
visitor.visit_pat(pat);
visitor.visit_expr(e);
}
}
}
visitor.visit_expr(&arm.body);