Segfault on `gamma(big(0))` on Julia v0.7 about specialfunctions.jl

[dlfivefifty]

julia> versioninfo()
Julia Version 0.7.0-alpha.236
Commit 2706a8d475 (2018-06-22 19:23 UTC)
Platform Info:
  OS: macOS (x86_64-apple-darwin17.6.0)
  CPU: Intel(R) Core(TM) i7-7700HQ CPU @ 2.80GHz
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-6.0.0 (ORCJIT, skylake)
Environment:
  JULIA_VERSION = 0.6

[ararslan]

I can reproduce. Here's the output when running with LLDB:

* thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0x10)
    frame #0: 0x000000011554ed99 libmpfr.6.dylib`mpfr_lgamma(y=0x0000000110a04df0, signp=0x0000000110a04dc0, x=0x0000000000000000, rnd=1606412720) at lngamma.c:772 [opt]
   769
   770 	  *signp = 1;  /* most common case */
   771
-> 772 	  if (MPFR_UNLIKELY (MPFR_IS_SINGULAR (x)))
   773 	    {
   774 	      if (MPFR_IS_NAN (x))
   775 	        {
Target 0: (julia) stopped.

Did this start recently, do you know? The MPFR-related changes that have happened in Base since the 0.6.x series have been JuliaLang/julia#27331 (recent) and JuliaLang/julia#25710 (January).

[dlfivefifty]

Between 12 and 3 days ago

https://travis-ci.org/ajt60gaibb/FastGaussQuadrature.jl/builds/390946260