CallStack is available from base 4.8, not 4.9
The documentation for CallStack claims it's available since 4.9 (ghc 8.0), but actually it's available since 4.8 (ghc 7.10).
Trac metadata
| Trac field | Value |
|---|---|
| Version | 7.10.3 |
| Type | Bug |
| TypeOfFailure | OtherFailure |
| Priority | low |
| Resolution | Unresolved |
| Component | Documentation |
| Test case | |
| Differential revisions | |
| BlockedBy | |
| Related | |
| Blocking | |
| CC | |
| Operating system | |
| Architecture |