runInteractiveProcess not using new PATH

run the below program with something like: rm -r foo; ghc env.hs && ./env

import System.Process( runInteractiveProcess, waitForProcess, ProcessHandle )
import System.Directory

main = do
  createDirectory "foo"
  writeFile "foo/bar" "#!/bin/sh\necho baz"
  (inH,outH,errH,procH) <- runInteractiveProcess "chmod" ["+x", "./foo/bar"] Nothing $ Just [("PATH","./foo")]
  ex <- waitForProcess procH
  print ex -- ExitSuccess
  (inH,outH,errH,procH) <- runInteractiveProcess "env" ["PATH=./foo", "bar"] Nothing $ Just [("PATH","./foo")]
  ex <- waitForProcess procH
  print ex -- ExitSuccess
  (inH,outH,errH,procH) <- runInteractiveProcess "bar" [] Nothing $ Just [("PATH","./foo")]
  ex <- waitForProcess procH
  print ex -- ExitFailure 127 (indicates command not found)

Trac metadata

Trac field	Value
Version	7.4.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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