bang patterns with infix ops

    $ ghci -fbang-patterns

-- Ok

    Prelude> let at a !b = False in at 1 2
    False

    Prelude> let (.!.) a !b = False in 1 .!. 2
    False

-- ~ patterns are ok

    Prelude> let a `at` ~b = False in at 1 2
    False

    Prelude> let a .!. ~b = False in 1 .!. 2
    False

    Prelude> let ~a .!. b = False in 1 .!. 2
    False

-- Parse error if we combine bang patterns with infix decls:

    Prelude> let a .!. !b = False in 1 .!. 2
    <interactive>:1:10: parse error on input `!'

    Prelude> let a `at` !b = False in at 1 2
    <interactive>:1:11: parse error on input `!'

    Prelude> let !a .!. b = False in 1 .!. 2
    <interactive>:1:5: Parse error in pattern

So looks like ops and infix declarations are missing a case for bang patterns.

-- Don

Trac metadata

Trac field	Value
Version	6.6
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler (Parser)
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system	Unknown
Architecture	Unknown