This is XeTeX, Version 3.14159265-2.6-0.99996 (TeX Live 2016) (preloaded format=xelatex)
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entering extended mode
(./test.tex
LaTeX2e <2016/03/31>
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kpathsea: Running mktextfm IPAexMincho/OT
/usr/local/texlive/2016/texmf-dist/web2c/mktexnam: Could not map source abbreviation O for OT.
/usr/local/texlive/2016/texmf-dist/web2c/mktexnam: Need to update /usr/local/texlive/2016/texmf-dist/fonts/map/fontname/special.map?
mktextfm: Running mf-nowin -progname=mf \mode:=ljfour; mag:=1; nonstopmode; input OT
This is METAFONT, Version 2.7182818 (TeX Live 2016) (preloaded base=mf)


kpathsea: Running mktexmf OT
! I can't find file `OT'.
<*> \mode:=ljfour; mag:=1; nonstopmode; input OT

Please type another input file name
! Emergency stop.
<*> \mode:=ljfour; mag:=1; nonstopmode; input OT

Transcript written on mfput.log.
grep: OT.log: No such file or directory
mktextfm: `mf-nowin -progname=mf \mode:=ljfour; mag:=1; nonstopmode; input OT' failed to make OT.tfm.
kpathsea: Appending font creation commands to missfont.log.


!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!
! fontspec error: "font-not-found"
!
! The font "IPAexMincho" cannot be found.
!
! See the fontspec documentation for further information.
!
! For immediate help type H <return>.
!...............................................

l.346 ...infont[BoldFont=IPAexGothic]{IPAexMincho}

? X
No pages of output.
Transcript written on test.log.