[t/spec/S05-substitution/subst.t] tests for RT #66816 Zero-width substitution makes the GC recurse
[t/spec/S05-substitution/subst.t] tests for RT #66816 Zero-width substitution makes the GC recurse

git-svn-id: 53605643c415f7495558be95614cf14171f1db78@31445 c213334d-75ef-0310-aa23-eaa082d1ae64

b2gills/roast,bitrauser/roast,dankogai/roast,perl6/roast,dogbert17/roast,niner/roast,laben/roast,zostay/roast,cygx/roast,b2gills/roast,b2gills/roast,cygx/roast,laben/roast,skids/roast,dankogai/roast,skids/roast,dogbert17/roast,niner/roast,cygx/roast,dankogai/roast,zostay/roast,laben/roast,bitrauser/roast,niner/roast,skids/roast,zostay/roast