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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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15
compiler/rustc_ast_lowering/src/expr.rs
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@ -505,14 +505,19 @@ impl<'hir> LoweringContext<'_, 'hir> {
}
fn lower_arm(&mut self, arm: &Arm) -> hir::Arm<'hir> {
let pat = self.lower_pat(&arm.pat);
let guard = arm.guard.as_ref().map(|cond| {
if let ExprKind::Let(ref pat, ref scrutinee) = cond.kind {
hir::Guard::IfLet(self.lower_pat(pat), self.lower_expr(scrutinee))
} else {
hir::Guard::If(self.lower_expr(cond))
}
});
hir::Arm {
hir_id: self.next_id(),
attrs: self.lower_attrs(&arm.attrs),
pat: self.lower_pat(&arm.pat),
guard: match arm.guard {
Some(ref x) => Some(hir::Guard::If(self.lower_expr(x))),
_ => None,
},
pat,
guard,
body: self.lower_expr(&arm.body),
span: arm.span,
}