GNU M4: expand bracketed text?

问题

If I run:

define(`[x]`,`y')
[x]
=>[x]

Nothing happens.. Is there a way to expand brackets in M4?

回答1:

If the name of the macro that you have defined contains non-alphanumeric characters the only way to expand its content is by using the defn() built-in macro:

define(`[x]',`y')
defn(`[x]')
=> y

来源：https://stackoverflow.com/questions/57205431/gnu-m4-expand-bracketed-text