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error: unexpected end of macro invocation
--> $DIR/issue-7970a.rs:6:5
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LL | macro_rules! one_arg_macro {
| -------------------------- when calling this macro
...
LL | one_arg_macro!();
| ^^^^^^^^^^^^^^^^ missing tokens in macro arguments
|
note: while trying to match meta-variable `$fmt:expr`
--> $DIR/issue-7970a.rs:2:6
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LL | ($fmt:expr) => (print!(concat!($fmt, "\n")));
| ^^^^^^^^^
error: aborting due to 1 previous error
|
