patch 8.0.0032
Problem: Tests may change the input file when something goes wrong.
Solution: Avoid writing the input file.
diff --git a/src/testdir/test51.in b/src/testdir/test51.in
index b4f45d1..b66befb 100644
--- a/src/testdir/test51.in
+++ b/src/testdir/test51.in
@@ -24,7 +24,7 @@
:hi Crash term='asdf
:redir END
:" filter ctermfg and ctermbg, the numbers depend on the terminal
-:e test.out
+:e! test.out
:%s/ctermfg=\d*/ctermfg=2/
:%s/ctermbg=\d*/ctermbg=3/
:" filter out possibly translated error message