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error: 1 positional argument in format string, but no arguments were given
--> $DIR/macro-backtrace-println.rs:24:30
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LL | ($fmt:expr) => (myprint!(concat!($fmt, "/n"))); //~ ERROR no arguments were given
| ^^^^^^^^^^^^^^^^^^^
...
LL | myprintln!("{}");
| ----------------- in this macro invocation
error: aborting due to previous error
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