Modifying TVar after calling always causes freeze/spin in GHCi
The attached code, if run under GHCi, causes GHCi to freeze while spinning the CPU. It works correctly when compiled, or if the ">> modifyTVar" part of f is commented out.
(For the curious: Yes, I believed always does what check does. Thankfully nothing had made its way into production code, because of this bug. The documentation should probably be clarified.)
Trac metadata
Trac field | Value |
---|---|
Version | 6.12.1 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | GHCi |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | |
Operating system | |
Architecture |