Test perl #4289

Test perl #4289

This was fixed by the disabling of PL_sawampersand a few commits ago.

The output used to be like this:

$ perl -e '$_ = "abc"; /b/g; $_ = "hello"; print eval q|$&|, "\n"'
e
$ perl -e '$_ = "abc"; /b/g; $_ = "hello"; print eval q|$`|, "\n"'
h
$ perl -e '$_ = "abc"; /b/g; $_ = "hello"; print eval q|$'\''|, "\n"'
l

Now it’s like this:

$ ./perl -e '$_ = "abc"; /b/g; $_ = "hello"; print eval q|$&|, "\n"'
b
$ ./perl -e '$_ = "abc"; /b/g; $_ = "hello"; print eval q|$`|, "\n"'
a
$ ./perl -e '$_ = "abc"; /b/g; $_ = "hello"; print eval q|$'\''|, "\n"'
c