Remove use of automatic adjacent string literal concatenation from phobos
Fix wrong test
replace use of deprecated canFind overload

- !canFind(not!isDigit) == all!isDigit
fix Issue 11973 - Please use any instead
Merge pull request #1876 from MartinNowak/canFind

replace use of deprecated canFind overload
Merge pull request #1871 from yebblies/stringcat

Remove use of automatic adjacent string literal concatenation from phobos
Merge pull request #1878 from WalterBright/fix11973

fix Issue 11973 - Please use any instead