Make the parser a bit stricter

diff --git a/compiler/parser/Parser.y.pp b/compiler/parser/Parser.y.pp
index cb25136..32ab991 100644 (file)
--- a/compiler/parser/Parser.y.pp
+++ b/compiler/parser/Parser.y.pp
@@ -1441,7 +1441,7 @@ list :: { LHsExpr RdrName }
        | texp '|' flattenedpquals      { sL (comb2 $1 $>) $ mkHsDo ListComp (unLoc $3) $1 }
 
 lexps :: { Located [LHsExpr RdrName] }
-       : lexps ',' texp                { LL ($3 : unLoc $1) }
+       : lexps ',' texp                { LL (((:) $! $3) $! unLoc $1) }
        | texp ',' texp                 { LL [$3,$1] }
 
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