#5930: add System.Environment.lookupEnv which returns Maybe instead of an
exception
------------------------------+---------------------------------------------
Reporter: elaforge | Owner:
Type: feature request | Status: new
Priority: normal | Component: libraries/base
Version: 7.4.1 | Keywords:
Os: Unknown/Multiple | Architecture: Unknown/Multiple
Failure: None/Unknown | Testcase:
Blockedby: | Blocking:
Related: |
------------------------------+---------------------------------------------
getEnv throws an exception when the key isn't found, which is surprising
and inconvenient. I'd prefer to change the signature of getEnv to return
Maybe, but that will break people's code, so I'll settle for a new
lookupEnv function.
It's been discussed on [email protected] and there was unanimous
support.
Patches attached, the first cleans up mixed tabs and spaces (which I
understand has been happening in ghc lately). The second adds the new
function. Unfortunately I still can't get ghc to compile so it's untested
for now. I'll keep trying with GHC, but I don't have a windows machine for
testing.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5930>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
_______________________________________________
Glasgow-haskell-bugs mailing list
[email protected]
http://www.haskell.org/mailman/listinfo/glasgow-haskell-bugs
