pahihu

Overlapping source/destination buffers in SUBSTITUTE tests

2

In stringtest.fth the following 2 tests use overlapping source and destination buffers and hence the tests fails: T{ $" c%mac3%d" 0 3 do-subst show $" czyxwvutd" 1 check-subst -> TRUE...

https://github.com/pahihu/t4/commit/97ac695f22f9baf9df375fba0d099be1fe06c981 breaks the Minix demo.