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error: 1 positional argument in format string, but no arguments were given
--> $DIR/macro-backtrace-println.rs:14:30
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LL | ($fmt:expr) => (myprint!(concat!($fmt, "\n")));
| ^^^^^^^^^^^^^^^^^^^
...
LL | myprintln!("{}");
| ---------------- in this macro invocation
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= note: this error originates in the macro `concat` which comes from the expansion of the macro `myprintln` (in Nightly builds, run with -Z macro-backtrace for more info)
error: aborting due to 1 previous error
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