Fix Issue 10647
fix Issue 10078 - std.string.indexOf fails at compile time
Merge pull request #1417 from dawgfoto/fix10078

fix Issue 10078 - std.string.indexOf fails at compile time
[trivial] fix code style
[trivial] Use ddoc unittest
[trivial] unittest code clean up
Make std.string module CTFEable
Merge pull request #1415 from 9rnsr/CTFEablePhobos

Make std.string module CTFEable
Merge branch 'master' into issue10647
Add unittest
Merge pull request #1414 from tom-tan/issue10647

Fix Issue 10647
missing throw
Merge pull request #1419 from dawgfoto/fixMissingThrow

missing throw