Sigh.  The testsuite fails utterly on Windows, with thousands of identical errors

=====> tc012(normal) 3039 of 4088 [1, 2677, 88]

cd .\typecheck\should_compile && 'C:/code/HEAD/inplace/bin/ghc-stage2.exe' -fforce-recomp -dcore-lint -dcmm-lint -dno-debug-output -no-user-package-db -rtsopts -fno-ghci-history -c tc012.hs   -fno-warn-incomplete-patterns >tc012.comp.stderr 2>&1

sh: line 0: cd: .typecheckshould_compile: No such file or directory

Compile failed (status 256) errors were:

*** unexpected failure for tc012(normal)

Presumably this is some kind of Windows escape-character problem.  But it has worked fine for years, so what is going on?

It’s very tiresome dealing with Windows breakage so frequently.   A few regression test failures, maybe, but outright breakage is very bad.

Simon