1 files changed, 38 insertions, 25 deletions

diff --git a/Master/texmf-dist/tex/latex/l3packages/xparse/xparse.sty b/Master/texmf-dist/tex/latex/l3packages/xparse/xparse.sty
index b7ecc485e91..2210b51102d 100644
--- a/Master/texmf-dist/tex/latex/l3packages/xparse/xparse.sty
+++ b/Master/texmf-dist/tex/latex/l3packages/xparse/xparse.sty
@@ -23,8 +23,8 @@
 %%                  (C) Copyright 2004-2008 Frank Mittelbach,
 %%                      The LaTeX3 Project
 %%                  (C) Copyright 2009-2017 The LaTeX3 Project
-\RequirePackage{expl3}[2017/07/15]
-\@ifpackagelater{expl3}{2017/07/15}
+\RequirePackage{expl3}[2017/07/19]
+\@ifpackagelater{expl3}{2017/07/19}
   {}
   {%
     \PackageError{xparse}{Support package l3kernel too old}
@@ -36,7 +36,7 @@
       }%
     \endinput
   }
-\ProvidesExplPackage{xparse}{2017/07/15}{}
+\ProvidesExplPackage{xparse}{2017/07/19}{}
   {L3 Experimental document command parser}
 \tl_const:Nx \c__xparse_no_value_tl
   { \char_generate:nn { `\- } { 11 } NoValue- }
@@ -450,9 +450,9 @@
   }
 \cs_new_protected:Npn \__xparse_normalize_type_D:w #1#2#3
   {
-    \__xparse_single_token_check:n {#1}
-    \__xparse_single_token_check:n {#2}
     \quark_if_recursion_tail_stop_do:nn {#3} { \__xparse_bad_arg_spec:wn }
+    \__xparse_single_char_check:n {#1}
+    \__xparse_single_char_check:n {#2}
     \__xparse_add_arg_spec:n { D #1 #2 {#3} }
     \tl_put_right:Nn \l__xparse_last_delimiters_tl {#1}
     \bool_set_false:N \l__xparse_grab_expandably_bool
@@ -462,7 +462,7 @@
   {
     \quark_if_recursion_tail_stop_do:nn {#2} { \__xparse_bad_arg_spec:wn }
     \tl_if_blank:nT {#1} { \__xparse_bad_arg_spec:wn }
-    \tl_map_function:nN {#1} \__xparse_single_token_check:n
+    \tl_map_function:nN {#1} \__xparse_single_char_check:n
     \__xparse_normalize_E_unique_check:w #1 \q_nil \q_stop
     \int_compare:nNnT { \tl_count:n {#2} } > { \tl_count:n {#1} }
       { \__xparse_bad_arg_spec:wn }
@@ -490,8 +490,8 @@
   }
 \cs_new_protected:Npn \__xparse_normalize_type_t:w #1
   {
-    \__xparse_single_token_check:n {#1}
     \quark_if_recursion_tail_stop_do:Nn #1 { \__xparse_bad_arg_spec:wn }
+    \__xparse_single_char_check:n {#1}
     \tl_put_right:Nn \l__xparse_arg_spec_tl { t #1 }
     \tl_put_right:Nn \l__xparse_last_delimiters_tl {#1}
     \bool_set_false:N \l__xparse_grab_expandably_bool
@@ -516,9 +516,9 @@
   }
 \cs_new_protected:Npn \__xparse_normalize_type_R:w #1#2#3
   {
-    \__xparse_single_token_check:n {#1}
-    \__xparse_single_token_check:n {#2}
     \quark_if_recursion_tail_stop_do:nn {#3} { \__xparse_bad_arg_spec:wn }
+    \__xparse_single_char_check:n {#1}
+    \__xparse_single_char_check:n {#2}
     \__xparse_delimiter_check:nnn {#1} { R/r } { \tl_to_str:n {#1} }
     \__xparse_add_arg_spec:n { R #1 #2 {#3} }
     \int_incr:N \l__xparse_mandatory_args_int
@@ -543,11 +543,22 @@
     \tl_clear:N \l__xparse_last_delimiters_tl
     \__xparse_normalize_arg_spec_loop:n
   }
-\cs_new_protected:Npn \__xparse_single_token_check:n #1
+\cs_new_protected:Npn \__xparse_single_char_check:n #1
   {
-    \exp_args:Nx \tl_if_single_token:nF { \tl_trim_spaces:n {#1} }
+    \exp_args:Nx \tl_if_single_token:nTF { \tl_trim_spaces:n {#1} }
       {
-        \__msg_kernel_error:nnxx { xparse } { not-single-token }
+        \group_begin:
+        \tex_escapechar:D = 92 \scan_stop:
+        \exp_args:Nx \tl_if_single_token:nF
+          { \exp_args:No \tl_to_str:n { \use:nn #1 { } } }
+          {
+            \__msg_kernel_warning:nnxx { xparse } { not-single-char }
+              { \iow_char:N \\ \l__xparse_function_tl } { \tl_to_str:n {#1} }
+          }
+        \group_end:
+      }
+      {
+        \__msg_kernel_error:nnxx { xparse } { not-single-char }
           { \iow_char:N \\ \l__xparse_function_tl } { \tl_to_str:n {#1} }
         \__xparse_bad_def:wn
       }
@@ -595,18 +606,17 @@
 \cs_new_protected:Npn \__xparse_bad_def:wn #1 \__xparse_break_point:n #2 { }
 \cs_new_protected:Npn \__xparse_add_arg_spec:n #1
   {
-    \bool_if:NF \l__xparse_long_bool
+    \bool_lazy_and:nnT
+      { ! \l__xparse_long_bool }
+      { \l__xparse_some_long_bool }
       {
-        \bool_if:NT \l__xparse_some_long_bool
+        \bool_if:NT \l__xparse_expandable_bool
           {
-            \bool_if:NT \l__xparse_expandable_bool
-              {
-                \__msg_kernel_error:nnx { xparse } { inconsistent-long }
-                  { \iow_char:N \\ \l__xparse_function_tl }
-                \__xparse_bad_def:wn
-              }
-            \bool_set_false:N \l__xparse_grab_expandably_bool
+            \__msg_kernel_error:nnx { xparse } { inconsistent-long }
+              { \iow_char:N \\ \l__xparse_function_tl }
+            \__xparse_bad_def:wn
           }
+        \bool_set_false:N \l__xparse_grab_expandably_bool
       }
     \bool_if:NTF \l__xparse_long_bool
       { \bool_set_true:N \l__xparse_some_long_bool }
@@ -1919,12 +1929,15 @@
     \\ \\
     LaTeX~will~ignore~this~entire~definition.
   }
-\__msg_kernel_new:nnnn { xparse } { not-single-token }
-  { Argument~delimiter~'#2'~for~the~command~'#1'~should~be~a~single~token. }
+\__msg_kernel_new:nnnn { xparse } { not-single-char }
+  {
+    Argument~delimiter~'#2'~for~the~command~'#1'~should~be~
+    a~single~character.
+  }
   {
     \c__msg_coding_error_text_tl
-    The~argument~specification~provided~was~not~valid:~
-    in~a~place~where~a~single~token~is~required,~LaTeX~found~'#2'. \\ \\
+    The~argument~specification~provided~was~not~valid:~in~a~place~
+    where~a~single~character~is~required,~LaTeX~found~'#2'. \\ \\
     LaTeX~will~ignore~this~entire~definition.
   }
 \__msg_kernel_new:nnnn { xparse } { processor-in-expandable }