fix Issue 13807 - inout(T)[] no longer matches string[]
add coverage tests for lexer.c
Merge pull request #4190 from 9rnsr/fix13807

[REG2.067a] Issue 13807 - inout(T)[] no longer matches string[]
Merge pull request #4191 from WalterBright/linkercov

add coverage tests for lexer.c