record construction accepts local unqualified name instead of qualified imported name
Given
module A where
data A = A { foo :: () } deriving Show
the following code is accepted
module Main where
import qualified A
foo = "foo"
main = print $ A.A { foo = () }
albeit with a warning
B.hs:4:16: warning: [-Wmissing-fields]
• Fields of ‘A.A’ not initialised: foo
Indeed the foo = () is type-checked as if it were A.foo = ()
but the foo field is actually not assigned. Evaluation gives
*Main> main
A {foo = *** Exception: B.hs:4:16-31: Missing field in record construction foo
The code should be rejected outright?
Trac metadata
| Trac field | Value |
|---|---|
| Version | 8.0.1 |
| Type | Bug |
| TypeOfFailure | OtherFailure |
| Priority | normal |
| Resolution | Unresolved |
| Component | Compiler |
| Test case | |
| Differential revisions | |
| BlockedBy | |
| Related | |
| Blocking | |
| CC | |
| Operating system | |
| Architecture |