Reverse do notation: lexer bug?
Noticed here:
http://calculist.blogspot.com/2007/07/cute-idiom-from-haskell.html
The following is accepted by GHC:
main = do
getChar -> c
print c
Yielding the same program as if we'd written;
main = do
c <- getChar
print c
The above blogger uses this to ingeniously embed:
gamma |- e -> v
in Haskell, but surely this is either a lexer bug, or an interesting syntactic feature that shouldn't be enabled by default?
Trac metadata
Trac field | Value |
---|---|
Version | 6.6.1 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Compiler (Parser) |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | dons@cse.unsw.edu.au |
Operating system | Unknown |
Architecture | Unknown |