%!TEX TS-program = xelatex
%!TEX encoding = UTF-8 Unicode
documentclass[11pt, a4paper]{report}

usepackage{fontspec}

usepackage{polyglossia}
setmainlanguage{english}
setotherlanguage[numerals=arabic]{thai}
newfontfamily{thaifont}[Script=Thai, Scale=1.3]{TH Sarabun New:script=thai}

XeTeXlinebreaklocale 'th_TH'

newfontfamily{sans}[Scale=1.0]{Helvetica}
newfontfamily{thai}[Scale=1.3]{TH Sarabun New}
newfontfamily{thaiit}[Scale=1.3]{TH Sarabun New Italic}
newfontfamily{thaibf}[Scale=1.3]{TH Sarabun New Bold}
newfontfamily{thaibi}[Scale=1.3]{TH Sarabun New Bold Italic}

(/opt/local/share/texmf-texlive/tex/latex/polyglossia/gloss-english.ldf
File: gloss-english.ldf polyglossia: module for english)
Package polyglossia Info: Default language is english.

(/opt/local/share/texmf-texlive/tex/latex/polyglossia/gloss-thai.ldf
File: gloss-thai.ldf polyglossia: module for thai)

Package fontspec Warning: Font "TH Sarabun New:script=thai" does not contain
(fontspec)                requested Script "Thai".


Package fontspec Info: Font family 'THSarabunNew:script=thai(0)' created for
(fontspec)             font 'TH Sarabun New:script=thai' with options
(fontspec)             [Script=Thai,Scale=1.3].
(fontspec)
(fontspec)              This font family consists of the following NFSS
(fontspec)             series/shapes:
(fontspec)
(fontspec)             - 'normal' (m/n) with NFSS spec.: <->s*[1.3]"TH Sarabun
(fontspec)             New:script=thai/OT:script=latn;language=DFLT;"
(fontspec)             - 'small caps'  (m/sc) with NFSS spec.:
(fontspec)             - 'bold' (bx/n) with NFSS spec.: <->s*[1.3]"TH Sarabun
(fontspec)             New:script=thai/B/OT:script=latn;language=DFLT;"
(fontspec)             - 'bold small caps'  (bx/sc) with NFSS spec.:
(fontspec)             - 'italic' (m/it) with NFSS spec.: <->s*[1.3]"TH
(fontspec)             Sarabun
(fontspec)             New:script=thai/I/OT:script=latn;language=DFLT;"
(fontspec)             - 'italic small caps'  (m/itsc) with NFSS spec.:
(fontspec)             - 'bold italic' (bx/it) with NFSS spec.: <->s* [1.3]"TH
(fontspec)             Sarabun
(fontspec)             New:script=thai/BI/OT:script=latn;language=DFLT;"
(fontspec)             - 'bold italic small caps'  (bx/itsc) with NFSS spec.:

Package fontspec Info: Font family 'THSarabunNew(0)' created for font 'TH
(fontspec)             Sarabun New' with options [Scale=1.3].
(fontspec)
(fontspec)              This font family consists of the following NFSS
(fontspec)             series/shapes:
(fontspec)
(fontspec)             - 'normal' (m/n) with NFSS spec.: <->s*[1.3]"TH Sarabun
(fontspec)             New/OT:script=latn;language=DFLT;"
(fontspec)             - 'small caps'  (m/sc) with NFSS spec.:
(fontspec)             - 'bold' (bx/n) with NFSS spec.: <->s*[1.3]"TH Sarabun
(fontspec)             New/B/OT:script=latn;language=DFLT;"
(fontspec)             - 'bold small caps'  (bx/sc) with NFSS spec.:
(fontspec)             - 'italic' (m/it) with NFSS spec.: <->s*[1.3]"TH
(fontspec)             Sarabun New/I/OT:script=latn;language=DFLT;"
(fontspec)             - 'italic small caps'  (m/itsc) with NFSS spec.:
(fontspec)             - 'bold italic' (bx/it) with NFSS spec.: <->s*[1.3]"TH
(fontspec)             Sarabun New/BI/OT:script=latn;language=DFLT;"
(fontspec)             - 'bold italic small caps'  (bx/itsc) with NFSS spec.:


./Misc58_ex.tex:39: LaTeX3 Error: Command 'thai' already defined!

For immediate help type H <return>.