You can't use `macro parameter character #' in restricted horizontal mode.
48844
How to obtain verbatim text in a footnote?
23227
Hiding ^M in emacs
127109
What does #x inside a C macro mean?
2604
Are \end.... macro names reserved in LaTeX2e?
109621
latex gives me the error: Ouch---my internal constants have been clobbered
117634
Macros with # as the last parameter
116800
Which shells don't support dollar-parenthesis expansion, and demand backticks?
55611
Using end-of-line delimiter in plain Tex macro
93299
Why is brace expansion not supported?
104939
Why do paramaters of \renewcommand need to double up the # within a \foreach
135468
Hiding part of the text when certain macro is enabled
55791
Java: Is there support for macros?
6411
Allowing line break at ',' in inline math mode?
89546
Where is the `--` (double dash) argument documented?
18646
Swallowing comma in variadic macros on compilers that do not recognise ##
61464
No space following macro without argument
60128
What are the valid characters for macro names?