Don't refute "()" in let-bindings (fixes #3104).

2012-08-21 21:03:47 -04:00
parent 8694ef6fb3
commit 9b489f6fff
2 changed files with 4 additions and 0 deletions
--- a/src/rustc/middle/check_alt.rs
+++ b/src/rustc/middle/check_alt.rs
@@ -420,6 +420,7 @@ fn is_refutable(tcx: ty::ctxt, pat: @pat) -> bool {
        is_refutable(tcx, sub)
      }
      pat_wild | pat_ident(_, _, none) => { false }
+      pat_lit(@{node: expr_lit(@{node: lit_nil, _}), _}) => { false } // "()"
      pat_lit(_) | pat_range(_, _) => { true }
      pat_rec(fields, _) => {
        for fields.each |it| {