l3kernel (6apr19)

git-svn-id: svn://tug.org/texlive/trunk@50818 c570f23f-e606-0410-a88d-b1316a301751

51 files changed, 99 insertions, 104 deletions

diff --git a/Master/texmf-dist/source/latex/l3kernel/expl3.dtx b/Master/texmf-dist/source/latex/l3kernel/expl3.dtx
index e38c47b17df..8d6c820b85a 100644
--- a/Master/texmf-dist/source/latex/l3kernel/expl3.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/expl3.dtx
@@ -23,7 +23,7 @@
 % for those people who are interested.
 %
 %<*driver|generic|package>
-\def\ExplFileDate{2019-03-26}%
+\def\ExplFileDate{2019-04-06}%
 %</driver|generic|package>
 %<*driver>
 \documentclass[full]{l3doc}
@@ -51,7 +51,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2019-03-26}
+% \date{Released 2019-04-06}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3alloc.dtx b/Master/texmf-dist/source/latex/l3kernel/l3alloc.dtx
index f9de29cfff9..483ad7d41ca 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3alloc.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3alloc.dtx
@@ -43,7 +43,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2019-03-26}
+% \date{Released 2019-04-06}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3basics.dtx b/Master/texmf-dist/source/latex/l3kernel/l3basics.dtx
index 1e55b108820..788b00f36fa 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3basics.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3basics.dtx
@@ -43,7 +43,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2019-03-26}
+% \date{Released 2019-04-06}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3bootstrap.dtx b/Master/texmf-dist/source/latex/l3kernel/l3bootstrap.dtx
index 640d6fe27ca..9c9efc05026 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3bootstrap.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3bootstrap.dtx
@@ -43,7 +43,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2019-03-26}
+% \date{Released 2019-04-06}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3box.dtx b/Master/texmf-dist/source/latex/l3kernel/l3box.dtx
index cb549a006f3..f65f9e45443 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3box.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3box.dtx
@@ -43,7 +43,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2019-03-26}
+% \date{Released 2019-04-06}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3candidates.dtx b/Master/texmf-dist/source/latex/l3kernel/l3candidates.dtx
index 8c4b64eaefa..1ce35fdd7fd 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3candidates.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3candidates.dtx
@@ -44,7 +44,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2019-03-26}
+% \date{Released 2019-04-06}
 %
 % \maketitle
 %
@@ -983,16 +983,6 @@
 %
 % \section{Additions to \pkg{l3tl}}
 %
-% \begin{function}[EXP,pTF]{\tl_if_single_token:n}
-%   \begin{syntax}
-%   \cs{tl_if_single_token_p:n} \Arg{token list}
-%   \cs{tl_if_single_token:nTF} \Arg{token list} \Arg{true code} \Arg{false code}
-%   \end{syntax}
-%   Tests if the token list consists of exactly one token, \emph{i.e.}~is
-%   either a single space character or a single \enquote{normal} token.
-%   Token groups (|{|\ldots|}|) are not single tokens.
-% \end{function}
-%
 % \begin{function}[EXP, added = 2014-06-30, updated = 2016-01-12]
 %   {
 %     \tl_lower_case:n,  \tl_upper_case:n,  \tl_mixed_case:n,
@@ -2554,36 +2544,6 @@
 %
 % \subsection{Additions to \pkg{l3tl}}
 %
-%    \begin{macrocode}
-%<@@=tl>
-%    \end{macrocode}
-%
-% \begin{macro}[EXP,pTF]{\tl_if_single_token:n}
-%   There are four cases: empty token list, token list starting with a
-%   normal token, with a brace group, or with a space token.  If the
-%   token list starts with a normal token, remove it and check for
-%   emptiness.  For the next case, an empty token list is not a single
-%   token.  Finally, we have a non-empty token list starting with a
-%   space or a brace group.  Applying \texttt{f}-expansion yields an
-%   empty result if and only if the token list is a single space.
-%    \begin{macrocode}
-\prg_new_conditional:Npnn \tl_if_single_token:n #1 { p , T , F , TF }
-  {
-    \tl_if_head_is_N_type:nTF {#1}
-      { \@@_if_empty_if:o { \use_none:n #1 } }
-      {
-        \tl_if_empty:nTF {#1}
-          { \if_false: }
-          { \@@_if_empty_if:o { \exp:w \exp_end_continue_f:w #1 } }
-      }
-      \prg_return_true:
-    \else:
-      \prg_return_false:
-    \fi:
-  }
-%    \end{macrocode}
-% \end{macro}
-%
 % \subsubsection{Unicode case changing}
 %
 % The mechanisms needed for case changing are somewhat involved, particularly
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3clist.dtx b/Master/texmf-dist/source/latex/l3kernel/l3clist.dtx
index c342d4958d8..172fabac50f 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3clist.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3clist.dtx
@@ -44,7 +44,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2019-03-26}
+% \date{Released 2019-04-06}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3coffins.dtx b/Master/texmf-dist/source/latex/l3kernel/l3coffins.dtx
index 72406a5e98b..7f6d327421f 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3coffins.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3coffins.dtx
@@ -43,7 +43,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2019-03-26}
+% \date{Released 2019-04-06}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3color-base.dtx b/Master/texmf-dist/source/latex/l3kernel/l3color-base.dtx
index 149d1bd84b7..0c0f462765a 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3color-base.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3color-base.dtx
@@ -43,7 +43,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2019-03-26}
+% \date{Released 2019-04-06}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3deprecation.dtx b/Master/texmf-dist/source/latex/l3kernel/l3deprecation.dtx
index 012bbb70819..4039dc67336 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3deprecation.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3deprecation.dtx
@@ -43,7 +43,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2019-03-26}
+% \date{Released 2019-04-06}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3doc.dtx b/Master/texmf-dist/source/latex/l3kernel/l3doc.dtx
index 0913ce5fa08..7a0cf4c9c1a 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3doc.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3doc.dtx
@@ -79,7 +79,7 @@ and all files in that bundle must be distributed together.
 %
 % \title{The \cls{l3doc} class}
 % \author{\Team}
-% \date{Released 2019-03-26}
+% \date{Released 2019-04-06}
 % \maketitle
 % \tableofcontents
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3docstrip.dtx b/Master/texmf-dist/source/latex/l3kernel/l3docstrip.dtx
index a6592e2cb74..ab16591782e 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3docstrip.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3docstrip.dtx
@@ -63,7 +63,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2019-03-26}
+% \date{Released 2019-04-06}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3drivers.dtx b/Master/texmf-dist/source/latex/l3kernel/l3drivers.dtx
index 48e8364bb7c..c7b6b85bc8f 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3drivers.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3drivers.dtx
@@ -43,7 +43,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2019-03-26}
+% \date{Released 2019-04-06}
 %
 % \maketitle
 %
@@ -556,23 +556,23 @@
 %<*package>
 \ProvidesExplFile
 %<*dvipdfmx>
-  {l3dvipdfmx.def}{2019-03-26}{}
+  {l3dvipdfmx.def}{2019-04-06}{}
   {L3 Experimental driver: dvipdfmx}
 %</dvipdfmx>
 %<*dvips>
-  {l3dvips.def}{2019-03-26}{}
+  {l3dvips.def}{2019-04-06}{}
   {L3 Experimental driver: dvips}
 %</dvips>
 %<*dvisvgm>
-  {l3dvisvgm.def}{2019-03-26}{}
+  {l3dvisvgm.def}{2019-04-06}{}
   {L3 Experimental driver: dvisvgm}
 %</dvisvgm>
 %<*pdfmode>
-  {l3pdfmode.def}{2019-03-26}{}
+  {l3pdfmode.def}{2019-04-06}{}
   {L3 Experimental driver: PDF mode}
 %</pdfmode>
 %<*xdvipdfmx>
-  {l3xdvipdfmx.def}{2019-03-26}{}
+  {l3xdvipdfmx.def}{2019-04-06}{}
   {L3 Experimental driver: xdvipdfmx}
 %</xdvipdfmx>
 %</package>
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3expan.dtx b/Master/texmf-dist/source/latex/l3kernel/l3expan.dtx
index 109e1e4ff74..640e75c609f 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3expan.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3expan.dtx
@@ -43,7 +43,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2019-03-26}
+% \date{Released 2019-04-06}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3file.dtx b/Master/texmf-dist/source/latex/l3kernel/l3file.dtx
index 16e6dde1214..a5710fed62e 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3file.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3file.dtx
@@ -44,7 +44,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2019-03-26}
+% \date{Released 2019-04-06}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3final.dtx b/Master/texmf-dist/source/latex/l3kernel/l3final.dtx
index 524c39c0d10..7d9c2d70dda 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3final.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3final.dtx
@@ -43,7 +43,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2019-03-26}
+% \date{Released 2019-04-06}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3flag.dtx b/Master/texmf-dist/source/latex/l3kernel/l3flag.dtx
index cfb8fe3a996..d16397bdcbe 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3flag.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3flag.dtx
@@ -43,7 +43,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2019-03-26}
+% \date{Released 2019-04-06}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3fp-assign.dtx b/Master/texmf-dist/source/latex/l3kernel/l3fp-assign.dtx
index 5208cc8a6bf..e6076353e7d 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3fp-assign.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3fp-assign.dtx
@@ -40,7 +40,7 @@
 %          {latex-team@latex-project.org}^^A
 %    }^^A
 % }
-% \date{Released 2019-03-26}
+% \date{Released 2019-04-06}
 % \maketitle
 %
 % \begin{documentation}
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3fp-aux.dtx b/Master/texmf-dist/source/latex/l3kernel/l3fp-aux.dtx
index b581392889e..68245401711 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3fp-aux.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3fp-aux.dtx
@@ -43,7 +43,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2019-03-26}
+% \date{Released 2019-04-06}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3fp-basics.dtx b/Master/texmf-dist/source/latex/l3kernel/l3fp-basics.dtx
index 85293b31e5c..e1dd67628c3 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3fp-basics.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3fp-basics.dtx
@@ -40,7 +40,7 @@
 %          {latex-team@latex-project.org}^^A
 %    }^^A
 % }
-% \date{Released 2019-03-26}
+% \date{Released 2019-04-06}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3fp-convert.dtx b/Master/texmf-dist/source/latex/l3kernel/l3fp-convert.dtx
index 599434274b1..e8cbbd7f3fc 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3fp-convert.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3fp-convert.dtx
@@ -43,7 +43,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2019-03-26}
+% \date{Released 2019-04-06}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3fp-expo.dtx b/Master/texmf-dist/source/latex/l3kernel/l3fp-expo.dtx
index 47594c3e4f6..b9e0f030867 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3fp-expo.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3fp-expo.dtx
@@ -40,7 +40,7 @@
 %          {latex-team@latex-project.org}^^A
 %    }^^A
 % }
-% \date{Released 2019-03-26}
+% \date{Released 2019-04-06}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3fp-extended.dtx b/Master/texmf-dist/source/latex/l3kernel/l3fp-extended.dtx
index 3fd805c8db0..7eee24882c3 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3fp-extended.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3fp-extended.dtx
@@ -40,7 +40,7 @@
 %          {latex-team@latex-project.org}^^A
 %    }^^A
 % }
-% \date{Released 2019-03-26}
+% \date{Released 2019-04-06}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3fp-logic.dtx b/Master/texmf-dist/source/latex/l3kernel/l3fp-logic.dtx
index 27960dbb5f2..18bf4d3be5f 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3fp-logic.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3fp-logic.dtx
@@ -40,7 +40,7 @@
 %          {latex-team@latex-project.org}^^A
 %    }^^A
 % }
-% \date{Released 2019-03-26}
+% \date{Released 2019-04-06}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3fp-parse.dtx b/Master/texmf-dist/source/latex/l3kernel/l3fp-parse.dtx
index 3d77f6a430d..7549f8ba84e 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3fp-parse.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3fp-parse.dtx
@@ -40,7 +40,7 @@
 %          {latex-team@latex-project.org}^^A
 %    }^^A
 % }
-% \date{Released 2019-03-26}
+% \date{Released 2019-04-06}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3fp-random.dtx b/Master/texmf-dist/source/latex/l3kernel/l3fp-random.dtx
index 44ae6296aa8..35ab233c74e 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3fp-random.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3fp-random.dtx
@@ -40,7 +40,7 @@
 %          {latex-team@latex-project.org}^^A
 %    }^^A
 % }
-% \date{Released 2019-03-26}
+% \date{Released 2019-04-06}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3fp-round.dtx b/Master/texmf-dist/source/latex/l3kernel/l3fp-round.dtx
index 0ac38fd08c8..aa47a54a059 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3fp-round.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3fp-round.dtx
@@ -43,7 +43,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2019-03-26}
+% \date{Released 2019-04-06}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3fp-traps.dtx b/Master/texmf-dist/source/latex/l3kernel/l3fp-traps.dtx
index ef26dffb7fd..5404b52b8d3 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3fp-traps.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3fp-traps.dtx
@@ -40,7 +40,7 @@
 %          {latex-team@latex-project.org}^^A
 %    }^^A
 % }
-% \date{Released 2019-03-26}
+% \date{Released 2019-04-06}
 % \maketitle
 %
 % \begin{documentation}
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3fp-trig.dtx b/Master/texmf-dist/source/latex/l3kernel/l3fp-trig.dtx
index 171b6df4978..c5198dc8873 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3fp-trig.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3fp-trig.dtx
@@ -40,7 +40,7 @@
 %          {latex-team@latex-project.org}^^A
 %    }^^A
 % }
-% \date{Released 2019-03-26}
+% \date{Released 2019-04-06}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3fp.dtx b/Master/texmf-dist/source/latex/l3kernel/l3fp.dtx
index d719c0cea35..f8040314ece 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3fp.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3fp.dtx
@@ -49,7 +49,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2019-03-26}
+% \date{Released 2019-04-06}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3fparray.dtx b/Master/texmf-dist/source/latex/l3kernel/l3fparray.dtx
index 629552e23bc..1529b05e7ba 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3fparray.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3fparray.dtx
@@ -44,7 +44,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2019-03-26}
+% \date{Released 2019-04-06}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3int.dtx b/Master/texmf-dist/source/latex/l3kernel/l3int.dtx
index 5637bb844ad..79cbc1f25c8 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3int.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3int.dtx
@@ -43,7 +43,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2019-03-26}
+% \date{Released 2019-04-06}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3intarray.dtx b/Master/texmf-dist/source/latex/l3kernel/l3intarray.dtx
index 6c3b5e1b0fc..2fd96a35a91 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3intarray.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3intarray.dtx
@@ -44,7 +44,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2019-03-26}
+% \date{Released 2019-04-06}
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 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3kernel-functions.dtx b/Master/texmf-dist/source/latex/l3kernel/l3kernel-functions.dtx
index ce0f5dbf9a6..937909439b3 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3kernel-functions.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3kernel-functions.dtx
@@ -43,7 +43,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2019-03-26}
+% \date{Released 2019-04-06}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3keys.dtx b/Master/texmf-dist/source/latex/l3kernel/l3keys.dtx
index 848903bd430..b13c8cc04d8 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3keys.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3keys.dtx
@@ -43,7 +43,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2019-03-26}
+% \date{Released 2019-04-06}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3luatex.dtx b/Master/texmf-dist/source/latex/l3kernel/l3luatex.dtx
index 2d0db7f06b4..272c0580221 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3luatex.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3luatex.dtx
@@ -43,7 +43,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2019-03-26}
+% \date{Released 2019-04-06}
 %
 % \maketitle
 %
@@ -319,9 +319,6 @@ local byte       = string.byte
 local floor      = math.floor
 local format     = string.format
 local gsub       = string.gsub
-if not resolvers then
-  local kpse_find  = kpse.find_file
-end
 local lfs_attr   = lfs.attributes
 local md5_sum    = md5.sum
 local open       = io.open
@@ -330,14 +327,16 @@ local os_date    = os.date
 local setcatcode = tex.setcatcode
 local sprint     = tex.sprint
 local write      = tex.write
-local utf8_char  = unicode.utf8.char
+%    \end{macrocode}
+%
+%   Newer Con\TeX{}t releases replace the |unicode| library by |utf|.
+%    \begin{macrocode}
+local utf8_char = (utf and utf.char) or unicode.utf8.char
 %    \end{macrocode}
 %
 %   Deal with Con\TeX{}t: doesn't use |kpse| library.
 %    \begin{macrocode}
-if resolvers then
-  kpse_find = resolvers.findfile
-end
+local kpse_find = (resolvers and resolvers.findfile) or kpse.find_file
 %    \end{macrocode}
 %
 % \begin{macro}[int]{escapehex}
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3msg.dtx b/Master/texmf-dist/source/latex/l3kernel/l3msg.dtx
index b5448fdd719..ef474b56734 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3msg.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3msg.dtx
@@ -43,7 +43,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2019-03-26}
+% \date{Released 2019-04-06}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3names.dtx b/Master/texmf-dist/source/latex/l3kernel/l3names.dtx
index 63ad2217ace..e8a90154628 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3names.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3names.dtx
@@ -43,7 +43,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2019-03-26}
+% \date{Released 2019-04-06}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3prg.dtx b/Master/texmf-dist/source/latex/l3kernel/l3prg.dtx
index 3ff03c19e0f..fe86d50bade 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3prg.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3prg.dtx
@@ -43,7 +43,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2019-03-26}
+% \date{Released 2019-04-06}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3prop.dtx b/Master/texmf-dist/source/latex/l3kernel/l3prop.dtx
index 4b60b49b997..076e09e4bf5 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3prop.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3prop.dtx
@@ -43,7 +43,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2019-03-26}
+% \date{Released 2019-04-06}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3quark.dtx b/Master/texmf-dist/source/latex/l3kernel/l3quark.dtx
index a58ade8653c..9b663a538e1 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3quark.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3quark.dtx
@@ -43,7 +43,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2019-03-26}
+% \date{Released 2019-04-06}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3regex.dtx b/Master/texmf-dist/source/latex/l3kernel/l3regex.dtx
index b7a171a69ad..94895525546 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3regex.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3regex.dtx
@@ -43,7 +43,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2019-03-26}
+% \date{Released 2019-04-06}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3seq.dtx b/Master/texmf-dist/source/latex/l3kernel/l3seq.dtx
index b2ed94ca238..336ffdc327d 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3seq.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3seq.dtx
@@ -43,7 +43,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2019-03-26}
+% \date{Released 2019-04-06}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3skip.dtx b/Master/texmf-dist/source/latex/l3kernel/l3skip.dtx
index 2b7b432bd34..9b6c49c2c83 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3skip.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3skip.dtx
@@ -44,7 +44,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2019-03-26}
+% \date{Released 2019-04-06}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3sort.dtx b/Master/texmf-dist/source/latex/l3kernel/l3sort.dtx
index 8ad657225b3..23f8b34f3bc 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3sort.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3sort.dtx
@@ -43,7 +43,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2019-03-26}
+% \date{Released 2019-04-06}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3str.dtx b/Master/texmf-dist/source/latex/l3kernel/l3str.dtx
index 5a72c24a295..18f8ba46ffb 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3str.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3str.dtx
@@ -43,7 +43,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2019-03-26}
+% \date{Released 2019-04-06}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3sys.dtx b/Master/texmf-dist/source/latex/l3kernel/l3sys.dtx
index 19ff9708ab0..8b2310a2be1 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3sys.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3sys.dtx
@@ -43,7 +43,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2019-03-26}
+% \date{Released 2019-04-06}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3tl-analysis.dtx b/Master/texmf-dist/source/latex/l3kernel/l3tl-analysis.dtx
index 1354795c3d6..e9ddfa0b424 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3tl-analysis.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3tl-analysis.dtx
@@ -44,7 +44,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2019-03-26}
+% \date{Released 2019-04-06}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3tl.dtx b/Master/texmf-dist/source/latex/l3kernel/l3tl.dtx
index a5eae16dbb9..c9d8c8b4825 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3tl.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3tl.dtx
@@ -43,7 +43,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2019-03-26}
+% \date{Released 2019-04-06}
 %
 % \maketitle
 %
@@ -469,6 +469,16 @@
 %   token count $1$ according to \cs{tl_count:n}.
 % \end{function}
 %
+% \begin{function}[EXP,pTF]{\tl_if_single_token:n}
+%   \begin{syntax}
+%   \cs{tl_if_single_token_p:n} \Arg{token list}
+%   \cs{tl_if_single_token:nTF} \Arg{token list} \Arg{true code} \Arg{false code}
+%   \end{syntax}
+%   Tests if the token list consists of exactly one token, \emph{i.e.}~is
+%   either a single space character or a single \enquote{normal} token.
+%   Token groups (|{|\ldots|}|) are not single tokens.
+% \end{function}
+%
 % \begin{function}[added = 2013-07-24, EXP, noTF]{\tl_case:Nn, \tl_case:cn}
 %   \begin{syntax}
 %     \cs{tl_case:NnTF} \meta{test token list variable} \\
@@ -2224,6 +2234,32 @@
 % \end{macro}
 % \end{macro}
 %
+% \begin{macro}[EXP,pTF]{\tl_if_single_token:n}
+%   There are four cases: empty token list, token list starting with a
+%   normal token, with a brace group, or with a space token.  If the
+%   token list starts with a normal token, remove it and check for
+%   emptiness.  For the next case, an empty token list is not a single
+%   token.  Finally, we have a non-empty token list starting with a
+%   space or a brace group.  Applying \texttt{f}-expansion yields an
+%   empty result if and only if the token list is a single space.
+%    \begin{macrocode}
+\prg_new_conditional:Npnn \tl_if_single_token:n #1 { p , T , F , TF }
+  {
+    \tl_if_head_is_N_type:nTF {#1}
+      { \@@_if_empty_if:o { \use_none:n #1 } }
+      {
+        \tl_if_empty:nTF {#1}
+          { \if_false: }
+          { \@@_if_empty_if:o { \exp:w \exp_end_continue_f:w #1 } }
+      }
+      \prg_return_true:
+    \else:
+      \prg_return_false:
+    \fi:
+  }
+%    \end{macrocode}
+% \end{macro}
+%
 % \begin{macro}[EXP, noTF]{\tl_case:Nn, \tl_case:cn}
 % \begin{macro}[EXP]{\@@_case:nnTF}
 % \begin{macro}[EXP]{\@@_case:Nw}
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3token.dtx b/Master/texmf-dist/source/latex/l3kernel/l3token.dtx
index 2e3d25e4bfb..410473230d4 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3token.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3token.dtx
@@ -43,7 +43,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2019-03-26}
+% \date{Released 2019-04-06}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3unicode.dtx b/Master/texmf-dist/source/latex/l3kernel/l3unicode.dtx
index 5d2a8bbafcd..35911365f33 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3unicode.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3unicode.dtx
@@ -43,7 +43,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2019-03-26}
+% \date{Released 2019-04-06}
 %
 % \maketitle
 %