Bug 17779 – [REG2.075.0] Link failure (undefined references) with std.regex and std.conv

//////////// test.d /////////// import std.conv; import std.regex; void fun(string s = text(0)) {} enum foo = regex(``); void main() {} /////////////////////////////// dmd test.d produces: test.o: In function `_D3std4conv17__T6toImplTAyaTiZ6toImplFNaNbNeikE3std5ascii10LetterCaseZAya': test.d:(.text._D3std4conv17__T6toImplTAyaTiZ6toImplFNaNbNeikE3std5ascii10LetterCaseZAya[_D3std4conv17__T6toImplTAyaTiZ6toImplFNaNbNeikE3std5ascii10LetterCaseZAya]+0x5e): undefined reference to `_D3std4conv47__T7toCharsVii10TaVE3std5ascii10LetterCasei1TiZ7toCharsFNaNbNiNfiZS3std4conv47__T7toCharsVii10TaVE3std5ascii10LetterCasei1TiZ7toCharsFNaNbNiNfiZ6Result' test.o: In function `_D3std5array96__T5arrayTS3std4conv47__T7toCharsVii10TaVE3std5ascii10LetterCasei1TiZ7toCharsFNaNbNiNfiZ6ResultZ5arrayFNaNbNfS3std4conv47__T7toCharsVii10TaVE3std5ascii10LetterCasei1TiZ7toCharsFNaNbNiNfiZ6ResultZAa': test.d:(.text._D3std5array96__T5arrayTS3std4conv47__T7toCharsVii10TaVE3std5ascii10LetterCasei1TiZ7toCharsFNaNbNiNfiZ6ResultZ5arrayFNaNbNfS3std4conv47__T7toCharsVii10TaVE3std5ascii10LetterCasei1TiZ7toCharsFNaNbNiNfiZ6ResultZAa[_D3std5array96__T5arrayTS3std4conv47__T7toCharsVii10TaVE3std5ascii10LetterCasei1TiZ7toCharsFNaNbNiNfiZ6ResultZ5arrayFNaNbNfS3std4conv47__T7toCharsVii10TaVE3std5ascii10LetterCasei1TiZ7toCharsFNaNbNiNfiZ6ResultZAa]+0xd): undefined reference to `_D3std4conv47__T7toCharsVii10TaVE3std5ascii10LetterCasei1TiZ7toCharsFNaNbNiNfiZ6Result6lengthMFNaNbNdNiNfZm' test.d:(.text._D3std5array96__T5arrayTS3std4conv47__T7toCharsVii10TaVE3std5ascii10LetterCasei1TiZ7toCharsFNaNbNiNfiZ6ResultZ5arrayFNaNbNfS3std4conv47__T7toCharsVii10TaVE3std5ascii10LetterCasei1TiZ7toCharsFNaNbNiNfiZ6ResultZAa[_D3std5array96__T5arrayTS3std4conv47__T7toCharsVii10TaVE3std5ascii10LetterCasei1TiZ7toCharsFNaNbNiNfiZ6ResultZ5arrayFNaNbNfS3std4conv47__T7toCharsVii10TaVE3std5ascii10LetterCasei1TiZ7toCharsFNaNbNiNfiZ6ResultZAa]+0x4f): undefined reference to `_D3std4conv47__T7toCharsVii10TaVE3std5ascii10LetterCasei1TiZ7toCharsFNaNbNiNfiZ6Result5emptyMFNaNbNdNiNfZb' test.d:(.text._D3std5array96__T5arrayTS3std4conv47__T7toCharsVii10TaVE3std5ascii10LetterCasei1TiZ7toCharsFNaNbNiNfiZ6ResultZ5arrayFNaNbNfS3std4conv47__T7toCharsVii10TaVE3std5ascii10LetterCasei1TiZ7toCharsFNaNbNiNfiZ6ResultZAa[_D3std5array96__T5arrayTS3std4conv47__T7toCharsVii10TaVE3std5ascii10LetterCasei1TiZ7toCharsFNaNbNiNfiZ6ResultZ5arrayFNaNbNfS3std4conv47__T7toCharsVii10TaVE3std5ascii10LetterCasei1TiZ7toCharsFNaNbNiNfiZ6ResultZAa]+0x5c): undefined reference to `_D3std4conv47__T7toCharsVii10TaVE3std5ascii10LetterCasei1TiZ7toCharsFNaNbNiNfiZ6Result5frontMFNaNbNdNiNfZa' test.d:(.text._D3std5array96__T5arrayTS3std4conv47__T7toCharsVii10TaVE3std5ascii10LetterCasei1TiZ7toCharsFNaNbNiNfiZ6ResultZ5arrayFNaNbNfS3std4conv47__T7toCharsVii10TaVE3std5ascii10LetterCasei1TiZ7toCharsFNaNbNiNfiZ6ResultZAa[_D3std5array96__T5arrayTS3std4conv47__T7toCharsVii10TaVE3std5ascii10LetterCasei1TiZ7toCharsFNaNbNiNfiZ6ResultZ5arrayFNaNbNfS3std4conv47__T7toCharsVii10TaVE3std5ascii10LetterCasei1TiZ7toCharsFNaNbNiNfiZ6ResultZAa]+0x9f): undefined reference to `_D3std4conv47__T7toCharsVii10TaVE3std5ascii10LetterCasei1TiZ7toCharsFNaNbNiNfiZ6Result8popFrontMFNaNbNiNfZv' test.o: In function `_D3std4conv110__T8textImplTAyaTAyaTPvTAyaTiTAyaTiTAyaTaTAyaThTAyaThTAyaTbTAyaTbTAyaTbTAyaTbTAyaTbTAyaTbTAyaTAxaTAyaTAxaTAyaZ8textImplFNaNfAyaPvAyaiAyaiAyaaAyahAyahAyabAyabAyabAyabAyabAyabAyaAxaAyaAxaAyaZAya': test.d:(.text._D3std4conv110__T8textImplTAyaTAyaTPvTAyaTiTAyaTiTAyaTaTAyaThTAyaThTAyaTbTAyaTbTAyaTbTAyaTbTAyaTbTAyaTbTAyaTAxaTAyaTAxaTAyaZ8textImplFNaNfAyaPvAyaiAyaiAyaaAyahAyahAyabAyabAyabAyabAyabAyabAyaAxaAyaAxaAyaZAya[_D3std4conv110__T8textImplTAyaTAyaTPvTAyaTiTAyaTiTAyaTaTAyaThTAyaThTAyaTbTAyaTbTAyaTbTAyaTbTAyaTbTAyaTbTAyaTAxaTAyaTAxaTAyaZ8textImplFNaNfAyaPvAyaiAyaiAyaaAyahAyahAyabAyabAyabAyabAyabAyabAyaAxaAyaAxaAyaZAya]+0xb9): undefined reference to `_D3std4conv47__T7toCharsVii10TaVE3std5ascii10LetterCasei1TiZ7toCharsFNaNbNiNfiZS3std4conv47__T7toCharsVii10TaVE3std5ascii10LetterCasei1TiZ7toCharsFNaNbNiNfiZ6Result' test.d:(.text._D3std4conv110__T8textImplTAyaTAyaTPvTAyaTiTAyaTiTAyaTaTAyaThTAyaThTAyaTbTAyaTbTAyaTbTAyaTbTAyaTbTAyaTbTAyaTAxaTAyaTAxaTAyaZ8textImplFNaNfAyaPvAyaiAyaiAyaaAyahAyahAyabAyabAyabAyabAyabAyabAyaAxaAyaAxaAyaZAya[_D3std4conv110__T8textImplTAyaTAyaTPvTAyaTiTAyaTiTAyaTaTAyaThTAyaThTAyaTbTAyaTbTAyaTbTAyaTbTAyaTbTAyaTbTAyaTAxaTAyaTAxaTAyaZ8textImplFNaNfAyaPvAyaiAyaiAyaaAyahAyahAyabAyabAyabAyabAyabAyabAyaAxaAyaAxaAyaZAya]+0xd1): undefined reference to `_D3std5array17__T8AppenderTAyaZ8Appender94__T3putTS3std4conv47__T7toCharsVii10TaVE3std5ascii10LetterCasei1TiZ7toCharsFNaNbNiNfiZ6ResultZ3putMFNaNbNfS3std4conv47__T7toCharsVii10TaVE3std5ascii10LetterCasei1TiZ7toCharsFNaNbNiNfiZ6ResultZv' test.d:(.text._D3std4conv110__T8textImplTAyaTAyaTPvTAyaTiTAyaTiTAyaTaTAyaThTAyaThTAyaTbTAyaTbTAyaTbTAyaTbTAyaTbTAyaTbTAyaTAxaTAyaTAxaTAyaZ8textImplFNaNfAyaPvAyaiAyaiAyaaAyahAyahAyabAyabAyabAyabAyabAyabAyaAxaAyaAxaAyaZAya[_D3std4conv110__T8textImplTAyaTAyaTPvTAyaTiTAyaTiTAyaTaTAyaThTAyaThTAyaTbTAyaTbTAyaTbTAyaTbTAyaTbTAyaTbTAyaTAxaTAyaTAxaTAyaZ8textImplFNaNfAyaPvAyaiAyaiAyaaAyahAyahAyabAyabAyabAyabAyabAyabAyaAxaAyaAxaAyaZAya]+0x114): undefined reference to `_D3std4conv47__T7toCharsVii10TaVE3std5ascii10LetterCasei1TiZ7toCharsFNaNbNiNfiZS3std4conv47__T7toCharsVii10TaVE3std5ascii10LetterCasei1TiZ7toCharsFNaNbNiNfiZ6Result' test.d:(.text._D3std4conv110__T8textImplTAyaTAyaTPvTAyaTiTAyaTiTAyaTaTAyaThTAyaThTAyaTbTAyaTbTAyaTbTAyaTbTAyaTbTAyaTbTAyaTAxaTAyaTAxaTAyaZ8textImplFNaNfAyaPvAyaiAyaiAyaaAyahAyahAyabAyabAyabAyabAyabAyabAyaAxaAyaAxaAyaZAya[_D3std4conv110__T8textImplTAyaTAyaTPvTAyaTiTAyaTiTAyaTaTAyaThTAyaThTAyaTbTAyaTbTAyaTbTAyaTbTAyaTbTAyaTbTAyaTAxaTAyaTAxaTAyaZ8textImplFNaNfAyaPvAyaiAyaiAyaaAyahAyahAyabAyabAyabAyabAyabAyabAyaAxaAyaAxaAyaZAya]+0x12c): undefined reference to `_D3std5array17__T8AppenderTAyaZ8Appender94__T3putTS3std4conv47__T7toCharsVii10TaVE3std5ascii10LetterCasei1TiZ7toCharsFNaNbNiNfiZ6ResultZ3putMFNaNbNfS3std4conv47__T7toCharsVii10TaVE3std5ascii10LetterCasei1TiZ7toCharsFNaNbNiNfiZ6ResultZv' test.o: In function `_D3std4conv17__T6toImplTAyaThZ6toImplFNaNbNehkE3std5ascii10LetterCaseZAya': test.d:(.text._D3std4conv17__T6toImplTAyaThZ6toImplFNaNbNehkE3std5ascii10LetterCaseZAya[_D3std4conv17__T6toImplTAyaThZ6toImplFNaNbNehkE3std5ascii10LetterCaseZAya]+0x60): undefined reference to `_D3std4conv47__T7toCharsVii10TaVE3std5ascii10LetterCasei1TiZ7toCharsFNaNbNiNfiZS3std4conv47__T7toCharsVii10TaVE3std5ascii10LetterCasei1TiZ7toCharsFNaNbNiNfiZ6Result' collect2: error: ld returned 1 exit status Error: linker exited with status 1 Introduced by https://github.com/dlang/phobos/pull/5352.

Works for me in v2.078.3