Commit 30fdf86e authored by Sergei Trofimovich's avatar Sergei Trofimovich Committed by Austin Seipp
Browse files

dwarf: sync getIdFromTrivialExpr with exprIsTrivial (test break028 and others)

The bug manifests when built with
    EXTRA_HC_OPTS += -g

+++ ./ghci.debugger/scripts/ 2014-12-19 23:08:46.199876621 +0000
@@ -0,0 +1,11 @@
+ghc-stage2: panic! (the 'impossible' happened)
+  (GHC version 7.9.20141219 for x86_64-unknown-linux):
+       getIdFromTrivialExpr x_alJ
+Please report this as a GHC bug:

+<interactive>:3:1: Not in scope: ‘g’
+<interactive>:3:3: Not in scope: data constructor ‘False’
Signed-off-by: default avatarSergei Trofimovich <>

Reviewers: simonmar, austin, scpmw

Reviewed By: scpmw

Subscribers: carter, thomie

Differential Revision:
parent 089222c9
......@@ -663,6 +663,7 @@ getIdFromTrivialExpr :: CoreExpr -> Id
getIdFromTrivialExpr e = go e
where go (Var v) = v
go (App f t) | not (isRuntimeArg t) = go f
go (Tick t e) | not (tickishIsCode t) = go e
go (Cast e _) = go e
go (Lam b e) | not (isRuntimeVar b) = go e
go e = pprPanic "getIdFromTrivialExpr" (ppr e)
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