[Dlang-internal] Looking for things to contribute to DMD code?

[Walter Bright]

These modules need unittests to get the coverage complete:

https://codecov.io/gh/dlang/dmd/src/master/src/dmd/root/array.d
https://codecov.io/gh/dlang/dmd/src/master/src/dmd/root/filename.d
https://codecov.io/gh/dlang/dmd/src/master/src/dmd/root/hash.d
https://codecov.io/gh/dlang/dmd/src/master/src/dmd/root/outbuffer.d

https://codecov.io/gh/dlang/dmd/src/master/src/dmd/root/response.d
(This one needs some refactoring so the getenv() call can be intercepted and 
mocked by the test code. The same with the call to File.read(). This refactoring 
will also be a great exercise in encapsulation and separation of logic.)

https://codecov.io/gh/dlang/dmd/src/master/src/dmd/root/string.d
https://codecov.io/gh/dlang/dmd/src/master/src/dmd/root/stringtable.d