The files in this directory where noted are part of the DRuntime and Phobos library. DRuntime is the low-level runtime library backing the D programming language, hosted at https://github.com/dlang/druntime/. Phobos is the standard library for the D Programming Language, hosted at https://github.com/dlang/phobos/. The following sources and directories are part of DRuntime: libdruntime/core/ libdruntime/gc/ libdruntime/gcstub/ libdruntime/object.d libdruntime/rt/ The following sources and directories are part of Phobos: src/etc/ src/index.d src/std/ To report a bug or look up known issues with the runtime or standard library please visit the issue tracker at https://issues.dlang.org/. All changes to either of these libraries should go through the upstream repository first, then merged back to GCC.