error: 1 positional argument in format string, but no arguments were given | |
--> $DIR/macro-backtrace-println.rs:14:30 | |
| | |
LL | ($fmt:expr) => (myprint!(concat!($fmt, "\n"))); | |
| ^^^^^^^^^^^^^^^^^^^ | |
... | |
LL | myprintln!("{}"); | |
| ----------------- in this macro invocation | |
error: aborting due to previous error | |