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callstack001 is sensitive to irrelevant internal changes
The `callstack001` test is sensitive to changes in the line numbers of definitions in `GHC.Internal.Base`: ``` GHC.Internal.Base.>>= (libraries/ghc-internal/src/GHC/Internal/Base.hs:1348:5-55) ``` This means that tiny changes to `GHC.Internal.Base` (such as adding a comment) can cause this test to fail. As far as I understand this test is just meant to be a simple sanity check for call stacks, ensuring for example that we see `>>=` somewhere in the call stack. The details really don't matter.
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