Testing library modules

[Graham Klyne]

I've just discovered that my recent checkins of Network.URI were not 
safe.  I thought that I had run the changes against my test suite, but just 
discovered that the test suite was actually being compiled against the 
version of Network.URI shipped with GHC 6.4.

I had expected the "-i" option on the GHC command line (see below) to 
override the shipped version of Network.URI.

As it happens, I've now checked the new module is OK by forcibly renaming 
the Network.URI files that were installed with GHC 6.4.  But this raises a 
concern for me:  how can I safely and reliably test a replacement version 
of a GHC-shipped library module?

#g
--

Batch file used to compile test suite on Windows:
[[
set 
INCL=E:\HaskellCVS\fptools\libraries\network;C:\Dev\Haskell\Lib\HUnit;C:\Dev\Haskell\Lib\Parsec
set GHCC=C:\DEV\ghc\ghc-6.4\bin\ghc
%GHCC% --make -fglasgow-exts  -ignore-package network-1.0. -i%INCL% -o 
%1.exe %1 -main-is %1.main
]]



------------
Graham Klyne
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