Fix egregious typo in TcUnify

Tom S found this bug by inspection; we've never seen it
fail in the wild, but it was obviosly Utterly Wrong

diff --git a/compiler/typecheck/TcUnify.lhs b/compiler/typecheck/TcUnify.lhs
index dac7803..e1b4bd4 100644 (file)
--- a/compiler/typecheck/TcUnify.lhs
+++ b/compiler/typecheck/TcUnify.lhs
@@ -526,7 +526,7 @@ boxyLub orig_ty1 orig_ty2
 
        -- Look inside type synonyms, but only if the naive version fails
     go ty1 ty2 | Just ty1' <- tcView ty1 = go ty1' ty2
-              | Just ty2' <- tcView ty1 = go ty1 ty2'
+              | Just ty2' <- tcView ty2 = go ty1 ty2'
 
     -- For now, we don't look inside ForAlls, PredTys
     go ty1 ty2 = orig_ty1      -- Default