LaTeX reader: don't allow optional * on symbol control sequences.

Generally we allow optional starred variants of LaTeX commands
(since many allow them, and if we don't accept these explicitly,
ignoring the star usually gives acceptable results).  But we
don't want to do this for `\(*\)` and similar cases.

Closes #7340.

1 files changed, 6 insertions, 0 deletions

diff --git a/test/command/7340.md b/test/command/7340.md
new file mode 100644
index 000000000..25decd732
--- /dev/null
+++ b/test/command/7340.md
@@ -0,0 +1,6 @@
+```
+% pandoc -f latex -t native
+\(*\)
+^D
+[Para [Math InlineMath "*"]]
+```