diff options
Diffstat (limited to 'src/elaborate.sml')
| -rw-r--r-- | src/elaborate.sml | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/src/elaborate.sml b/src/elaborate.sml index 9765b090..6965adfd 100644 --- a/src/elaborate.sml +++ b/src/elaborate.sml @@ -1565,7 +1565,7 @@ fun elabPat (pAll as (p, loc), (env, bound)) = case p of L.PVar x => let - val t = if SS.member (bound, x) then + val t = if x <> "_" andalso SS.member (bound, x) then (expError env (DuplicatePatternVariable (loc, x)); terror) else |