Peculiar anomaly with record style data types and deriving Read
-- Given this data type
data Foo = Foo { foo :: Int } deriving (Read, Show)
-- this fails
bar :: Foo
bar = read "Foo 42"
-- However, non-record-style construction is allowed:
baz :: Foo
baz = Foo 42
Trac metadata
| Trac field | Value |
|---|---|
| Version | 6.10.4 |
| Type | Bug |
| TypeOfFailure | OtherFailure |
| Priority | normal |
| Resolution | Unresolved |
| Component | Compiler |
| Test case | |
| Differential revisions | |
| BlockedBy | |
| Related | |
| Blocking | |
| CC | |
| Operating system | |
| Architecture |