Test suite: Resistance against CallStack line number changes

Hi,

I just got this:

Actual stderr output differs from expected:
--- ./ghci/scripts/T10501.stderr.normalised	2015-09-03 00:20:22.622940998 +0000
+++ ./ghci/scripts/T10501.run.stderr.normalised	2015-09-03 00:20:22.622940998 +0000
@@ -1,6 +1,6 @@
 *** Exception: Prelude.head: empty list
 CallStack:
-  error, called at libraries/base/GHC/List.hs:1009:3 in base:GHC.List
+  error, called at libraries/base/GHC/List.hs:1011:3 in base:GHC.List
 *** Exception: Prelude.undefined
 CallStack:
   error, called at libraries/base/GHC/Err.hs:42:14 in base:GHC.Err
*** unexpected failure for T10501(ghci)

Having the test suite so fragile is annoying. Would it be possible to ignore line number differences in call stacks?

Trac metadata

Trac field	Value
Version	7.10.2
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Test Suite
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