Pattern synonym parse error should recommend enabling extension
Currently, if you try to use pattern synonyms in a module without -XPatternSynonyms, you can get a very uninformative parse error. For example:
module X where
import Data.Text (pattern Y)
x = 3Yields, when compiled on GHC 7.10,
test.hs:3:27: parse error on input "Y"It would be helpful if in addition to the error, the message suggested to the user to enable the PatternSynonyms extension, as many other error messages already do.
Trac metadata
| Trac field | Value |
|---|---|
| Version | 7.10.3 |
| Type | Bug |
| TypeOfFailure | OtherFailure |
| Priority | low |
| Resolution | Unresolved |
| Component | Compiler |
| Test case | |
| Differential revisions | |
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| Related | |
| Blocking | |
| CC | |
| Operating system | |
| Architecture |