Bad error message if $TMP does not exist

$ ghc --version
The Glorious Glasgow Haskell Compilation System, version 6.10.4
$ set TMP=c:\none
$ ghc --make Main.hs
CreateDirectory: does not exist (The system cannot find the path specified.)

If the %TMP% environment variable is set to a directory that does not exist, then GHC gives a very uninformative error message. I suggest that CreateDirectory always give the name of the directory when it fails, and that GHC traps this error and gives a better error.

Tracking this bug down took a while - I'd like to spare other users my pain :-)

Trac metadata

Trac field	Value
Version	6.10.4
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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Bad error message if $TMP does not exist