Hi,
I am running the rust compiler from trunk. My macro usage seems to be a
----
macro_rules! my_print(
($a:expr, $b:expr) => (
io::println(fmt!("%d", a));
io::println(fmt!("%d", b));
);
)
fn main() {
let a : int = 1;
let b : int = 2;
my_print!(a, b);
}
----
Compiling with "rustc tmp.rs" gives the following suspicious warning
----
tmp.rs:10:8: 10:11 warning: unused variable: `b`
tmp.rs:10 let b : int = 2;
----
and ./tmp prints only "1". Running "rustc tmp.rs --pretty expanded"
shows below that the second line "io::println(fmt!("%d", b));" was
ignored.
----
fn main() {
let a: int = 1;
let b: int = 2;
io::println({
let mut __fmtbuf = ~"";
::unstable::extfmt::rt::conv_int(::unstable::extfmt::rt::Conv{flags:
::unstable::extfmt::rt::flag_none,
width:
::unstable::extfmt::rt::CountImplied,
precision:
::unstable::extfmt::rt::CountImplied,
ty:
::unstable::extfmt::rt::TyDefault,},
a, &mut __fmtbuf);
__fmtbuf
});
}
----
Can someone point me in the right direction here?
Also, can someone provide examples of how exactly log_syntax!() and
trace_macros!(true) work?
Ashish
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