Standard Macros
Standard Macros được định nghĩa bởi compiler và std.
print!, println!, eprint!, eprintln!
format!, format_args!
write!, writeln!
concat!, concat_idents!, stringify // concat_idents: nightly-only experimental API
include!, include_bytes!, include_str!
assert!, assert_eq!, assert_ne!
debug_assert!, debug_assert_eq!, debug_assert_ne!
try!, panic!, compile_error!, unreachable!, unimplemented!
file!, line!, column!, module_path!
env!, option_env!
cfg!
select!, thread_local! // select: nightly-only experimental API
vec!