Runtime <<loop>> due to incorrect inferred type
There is a bug in the type checker of 7.6.1 and 7.6.2, which accepts an incorrect type resulting in <<loop>> at runtime. Furthermore, 7.6.2 even automatically infers this incorrect type. Hence, the attached code has the following behavior:
- No explicit type: Code works in 7.6.1, loops in 7.6.2
- Correct explicit type: Code works fine in 7.6.1 and 7.6.2
- Incorrect explicit type: Code loops in 7.6.1 and 7.6.2
The incorrect type has a parameter that is too polymorphic, i.e. an "a" type is accepted while the function does a pattern match on the parameter from which it is clear that it should be a Maybe type. In 7.4.* versions this incorrect type is not accepted.
Trac metadata
| Trac field | Value |
|---|---|
| Version | 7.6.2 |
| Type | Bug |
| TypeOfFailure | OtherFailure |
| Priority | normal |
| Resolution | Unresolved |
| Component | Compiler (Type checker) |
| Test case | |
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