I want use concat_idents! in this way
static concat_idents!($name, MAP): // Type = ....
but I can't, and issue about concat_idents!() is tracked at rust-lang/rust#29599.
And also concat_idents!!($name, MAP) from comment does not work.
How can I bypass this issue?
You can't.
It's made-up speculative syntax.
You don't.
...not unless you want to write a compiler plugin and limit yourself to nightly compilers and tracking changes in libsyntax forevermore.
If you want identifiers, they have to be passed into the macro when you invoke it.
Thanks. I will use it, as my purpose is too simple to create a plugin.