Control.Concurrent.MVar doesn't need to depend on the Prelude
Control.Concurrent.MVar currently depends on the Prelude, causing an import cycle in the new I/O manager. This patch replaces the dependency on the Prelude with modules in the GHC hierarchy, breaking the cycle.
Trac metadata
| Trac field | Value |
|---|---|
| Version | 6.13 |
| Type | Bug |
| TypeOfFailure | OtherFailure |
| Priority | normal |
| Resolution | Unresolved |
| Component | libraries/base |
| Test case | |
| Differential revisions | |
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| Operating system | |
| Architecture |