UX: Weird error message for enumeration [A..B]
data D = A | B deriving (Eq, Enum)
test = (`elem` [A..B])
gives weird error messages:
Not in scope: ‘A..’
No module named ‘A’ is imported.
|
2 | test = (`elem` [A..B])
| ^^^
A section must be enclosed in parentheses thus: (A.. B)
|
2 | test = (`elem` [A..B])
| ^^^^
The first error is somewhat excused from a developer perspective: we all know our parsers are not perfect. Still, might confuse beginners. The second error is clearly a WAT.
(Workaround: [A ..B]
space after A
)
I experience these errors with GHC 8.6.4, but also back till 7.6.3.