[latex3-commits] [git/LaTeX3-latex3-latex2e] gh005: macro env doesn't like an empty argument (1384903b)

[Frank Mittelbach]

Repository : https://github.com/latex3/latex2e
On branch  : gh005
Link       : https://github.com/latex3/latex2e/commit/1384903b96aaab651ec04d07e958132db7b75b8e

>---------------------------------------------------------------

commit 1384903b96aaab651ec04d07e958132db7b75b8e
Author: Frank Mittelbach <frank.mittelbach at latex-project.org>
Date:   Tue Mar 10 19:52:20 2020 +0100

    macro env doesn't like an empty argument


>---------------------------------------------------------------

1384903b96aaab651ec04d07e958132db7b75b8e
 required/amsmath/amsmath.dtx | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/required/amsmath/amsmath.dtx b/required/amsmath/amsmath.dtx
index a5b94dae..59d7d620 100644
--- a/required/amsmath/amsmath.dtx
+++ b/required/amsmath/amsmath.dtx
@@ -3657,8 +3657,8 @@ and fix things up.}
 %  \end{macro}
 %
 %
-
-%  \begin{macro}{}
+%
+%  \begin{macro}{\ams at start@box}
 %    
 % \changes{v2.17g}{2020/03/10}{Explicity test for b/t/c and return
 %    optional argument is different (gh/5)}
@@ -3670,11 +3670,21 @@ and fix things up.}
   \else
      \let\ams at return@opt at arg\@empty\reserved at a \fi
 }
+%    \end{macrocode}
+%    
+%  \begin{macro}{\ams at pos@t}
+%  \begin{macro}{\ams at pos@b}
+%  \begin{macro}{\ams at pos@c}
+%
+%    \begin{macrocode}
 \def\ams at pos@t{\vtop}
 \def\ams at pos@b{\vbox}
 \def\ams at pos@c{\vcenter}
 %    \end{macrocode}
 %  \end{macro}
+%  \end{macro}
+%  \end{macro}
+%  \end{macro}
 %
 %    \begin{macro}{\start at aligned}
 %    The \env{aligned} and \env{alignedat} environments are identical