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Remove CallStack CPP guards in GHC 8.4
GHC 7.10.1 didn't support CallStack, while its successors did. Yet in post-8.0 master (which needs to be buildable with the 7.10 series, including 7.10.1) references to CallStack have begun to sneak in to GHC.
The first instance of this was 9d33adb6 but there will likely be more. I've fixed in this instance in D1812 by adding #if guards. These should be removed in GHC 8.2.
Trac metadata
| Trac field | Value |
|---|---|
| Version | 7.10.3 |
| Type | Task |
| TypeOfFailure | OtherFailure |
| Priority | normal |
| Resolution | Unresolved |
| Component | Compiler |
| Test case | |
| Differential revisions | |
| BlockedBy | |
| Related | |
| Blocking | |
| CC | |
| Operating system | |
| Architecture |
Edited by Ben Gamari