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## 编译环境
操作系统
* [x]` Windows 7/8/10
* [ ] macOS
* [ ] Linux
`若需勾选,请把[ ]改成[x]`
Tex发行版
* [x]` TexLive `2020`
* [ ] MikTeX `版本号`
* [ ] CTeX
`若需勾选,请把[ ]改成[x]`
## 我的问题
在此输入你遇到的问题...
用tikz画图画角度时遇到错误
```
Command Line: xelatex.exe --interaction=errorstopmode --synctex=-1 "test.tex"
Startup Folder: E:\Experiment-slide
This is XeTeX, Version 3.14159265-2.6-0.999992 (TeX Live 2020/W32TeX) (preloaded format=xelatex)
restricted \write18 enabled.
entering extended mode
(./test.tex
LaTeX2e <2020-10-01> patch level 4
L3 programming layer <2021-02-18>
(c:/texlive/texmf-dist/tex/latex/standalone/standalone.cls
Document Class: standalone 2018/03/26 v1.3a Class to compile TeX sub-files stan
dalone
(c:/texlive/texmf-dist/tex/latex/tools/shellesc.sty)
(c:/texlive/texmf-dist/tex/generic/iftex/ifluatex.sty
(c:/texlive/texmf-dist/tex/generic/iftex/iftex.sty))
(c:/texlive/texmf-dist/tex/latex/xkeyval/xkeyval.sty
(c:/texlive/texmf-dist/tex/generic/xkeyval/xkeyval.tex
(c:/texlive/texmf-dist/tex/generic/xkeyval/xkvutils.tex
(c:/texlive/texmf-dist/tex/generic/xkeyval/keyval.tex))))
(c:/texlive/texmf-dist/tex/latex/standalone/standalone.cfg)
(c:/texlive/texmf-dist/tex/latex/base/article.cls
Document Class: article 2020/04/10 v1.4m Standard LaTeX document class
(c:/texlive/texmf-dist/tex/latex/base/size10.clo))
(c:/texlive/texmf-dist/tex/latex/pgf/frontendlayer/tikz.sty
(c:/texlive/texmf-dist/tex/latex/pgf/basiclayer/pgf.sty
(c:/texlive/texmf-dist/tex/latex/pgf/utilities/pgfrcs.sty
(c:/texlive/texmf-dist/tex/generic/pgf/utilities/pgfutil-common.tex
(c:/texlive/texmf-dist/tex/generic/pgf/utilities/pgfutil-common-lists.tex))
(c:/texlive/texmf-dist/tex/generic/pgf/utilities/pgfutil-latex.def)
(c:/texlive/texmf-dist/tex/generic/pgf/utilities/pgfrcs.code.tex
(c:/texlive/texmf-dist/tex/generic/pgf/pgf.revision.tex)))
(c:/texlive/texmf-dist/tex/latex/pgf/basiclayer/pgfcore.sty
(c:/texlive/texmf-dist/tex/latex/graphics/graphicx.sty
(c:/texlive/texmf-dist/tex/latex/graphics/graphics.sty
(c:/texlive/texmf-dist/tex/latex/graphics/trig.sty)
(c:/texlive/texmf-dist/tex/latex/graphics-cfg/graphics.cfg)
(c:/texlive/texmf-dist/tex/latex/graphics-def/xetex.def)))
(c:/texlive/texmf-dist/tex/latex/pgf/systemlayer/pgfsys.sty
(c:/texlive/texmf-dist/tex/generic/pgf/systemlayer/pgfsys.code.tex
(c:/texlive/texmf-dist/tex/generic/pgf/utilities/pgfkeys.code.tex
(c:/texlive/texmf-dist/tex/generic/pgf/utilities/pgfkeysfiltered.code.tex))
(c:/texlive/texmf-dist/tex/generic/pgf/systemlayer/pgf.cfg)
(c:/texlive/texmf-dist/tex/generic/pgf/systemlayer/pgfsys-xetex.def
(c:/texlive/texmf-dist/tex/generic/pgf/systemlayer/pgfsys-dvipdfmx.def
(c:/texlive/texmf-dist/tex/generic/pgf/systemlayer/pgfsys-common-pdf.def))))
(c:/texlive/texmf-dist/tex/generic/pgf/systemlayer/pgfsyssoftpath.code.tex)
(c:/texlive/texmf-dist/tex/generic/pgf/systemlayer/pgfsysprotocol.code.tex))
(c:/texlive/texmf-dist/tex/latex/xcolor/xcolor.sty
(c:/texlive/texmf-dist/tex/latex/graphics-cfg/color.cfg))
(c:/texlive/texmf-dist/tex/generic/pgf/basiclayer/pgfcore.code.tex
(c:/texlive/texmf-dist/tex/generic/pgf/math/pgfmath.code.tex
(c:/texlive/texmf-dist/tex/generic/pgf/math/pgfmathcalc.code.tex
(c:/texlive/texmf-dist/tex/generic/pgf/math/pgfmathutil.code.tex)
(c:/texlive/texmf-dist/tex/generic/pgf/math/pgfmathparser.code.tex)
(c:/texlive/texmf-dist/tex/generic/pgf/math/pgfmathfunctions.code.tex
(c:/texlive/texmf-dist/tex/generic/pgf/math/pgfmathfunctions.basic.code.tex)
(c:/texlive/texmf-dist/tex/generic/pgf/math/pgfmathfunctions.trigonometric.code
.tex)
(c:/texlive/texmf-dist/tex/generic/pgf/math/pgfmathfunctions.random.code.tex)
(c:/texlive/texmf-dist/tex/generic/pgf/math/pgfmathfunctions.comparison.code.te
x) (c:/texlive/texmf-dist/tex/generic/pgf/math/pgfmathfunctions.base.code.tex)
(c:/texlive/texmf-dist/tex/generic/pgf/math/pgfmathfunctions.round.code.tex)
(c:/texlive/texmf-dist/tex/generic/pgf/math/pgfmathfunctions.misc.code.tex)
(c:/texlive/texmf-dist/tex/generic/pgf/math/pgfmathfunctions.integerarithmetics
.code.tex))) (c:/texlive/texmf-dist/tex/generic/pgf/math/pgfmathfloat.code.tex)
) (c:/texlive/texmf-dist/tex/generic/pgf/math/pgfint.code.tex)
(c:/texlive/texmf-dist/tex/generic/pgf/basiclayer/pgfcorepoints.code.tex)
(c:/texlive/texmf-dist/tex/generic/pgf/basiclayer/pgfcorepathconstruct.code.tex
) (c:/texlive/texmf-dist/tex/generic/pgf/basiclayer/pgfcorepathusage.code.tex)
(c:/texlive/texmf-dist/tex/generic/pgf/basiclayer/pgfcorescopes.code.tex)
(c:/texlive/texmf-dist/tex/generic/pgf/basiclayer/pgfcoregraphicstate.code.tex)
(c:/texlive/texmf-dist/tex/generic/pgf/basiclayer/pgfcoretransformations.code.t
ex) (c:/texlive/texmf-dist/tex/generic/pgf/basiclayer/pgfcorequick.code.tex)
(c:/texlive/texmf-dist/tex/generic/pgf/basiclayer/pgfcoreobjects.code.tex)
(c:/texlive/texmf-dist/tex/generic/pgf/basiclayer/pgfcorepathprocessing.code.te
x) (c:/texlive/texmf-dist/tex/generic/pgf/basiclayer/pgfcorearrows.code.tex)
(c:/texlive/texmf-dist/tex/generic/pgf/basiclayer/pgfcoreshade.code.tex)
(c:/texlive/texmf-dist/tex/generic/pgf/basiclayer/pgfcoreimage.code.tex
(c:/texlive/texmf-dist/tex/generic/pgf/basiclayer/pgfcoreexternal.code.tex))
(c:/texlive/texmf-dist/tex/generic/pgf/basiclayer/pgfcorelayers.code.tex)
(c:/texlive/texmf-dist/tex/generic/pgf/basiclayer/pgfcoretransparency.code.tex)
(c:/texlive/texmf-dist/tex/generic/pgf/basiclayer/pgfcorepatterns.code.tex)
(c:/texlive/texmf-dist/tex/generic/pgf/basiclayer/pgfcorerdf.code.tex)))
(c:/texlive/texmf-dist/tex/generic/pgf/modules/pgfmoduleshapes.code.tex)
(c:/texlive/texmf-dist/tex/generic/pgf/modules/pgfmoduleplot.code.tex)
(c:/texlive/texmf-dist/tex/latex/pgf/compatibility/pgfcomp-version-0-65.sty)
(c:/texlive/texmf-dist/tex/latex/pgf/compatibility/pgfcomp-version-1-18.sty))
(c:/texlive/texmf-dist/tex/latex/pgf/utilities/pgffor.sty
(c:/texlive/texmf-dist/tex/latex/pgf/utilities/pgfkeys.sty
(c:/texlive/texmf-dist/tex/generic/pgf/utilities/pgfkeys.code.tex))
(c:/texlive/texmf-dist/tex/latex/pgf/math/pgfmath.sty
(c:/texlive/texmf-dist/tex/generic/pgf/math/pgfmath.code.tex))
(c:/texlive/texmf-dist/tex/generic/pgf/utilities/pgffor.code.tex
(c:/texlive/texmf-dist/tex/generic/pgf/math/pgfmath.code.tex)))
(c:/texlive/texmf-dist/tex/generic/pgf/frontendlayer/tikz/tikz.code.tex
(c:/texlive/texmf-dist/tex/generic/pgf/libraries/pgflibraryplothandlers.code.te
x) (c:/texlive/texmf-dist/tex/generic/pgf/modules/pgfmodulematrix.code.tex)
(c:/texlive/texmf-dist/tex/generic/pgf/frontendlayer/tikz/libraries/tikzlibrary
topaths.code.tex))))
(c:/texlive/texmf-dist/tex/generic/pgf/frontendlayer/tikz/libraries/tikzlibrary
angles.code.tex) (c:/texlive/texmf-dist/tex/latex/l3backend/l3backend-xetex.def
(|extractbb --version)) (./test.aux)
(c:/texlive/texmf-dist/tex/latex/base/ts1cmr.fd)
! Missing \endcsname inserted.
\alpha
l.6 pic ["$\alpha$", draw, ->]
{angle};
?
Process has been terminated ...
```
最小实例如下
```
\documentclass[tikz,border=5]{standalone}
\usetikzlibrary{angles}
\begin{document}
\tikz \draw (2,0) coordinate (A) -- (0,0) coordinate (B)
-- (1,1) coordinate (C)
pic ["$\alpha$", draw, ->] {angle};
\end{document}
```
请问是哪里出了问题,谢谢大家