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error: invalid reference to argument `0` (no arguments given)
--> $DIR/macro-backtrace-println.rs:24:30
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24 | ($fmt:expr) => (myprint!(concat!($fmt, "/n")));
| ^^^^^^^^^^^^^^^^^^^
...
28 | myprintln!("{}");
| ----------------- in this macro invocation
error: aborting due to previous error
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