core_extensions/macros/
internal.rs

1#[allow(unused_macros)]
2macro_rules! cfg_if {
3    (($meta:meta) $then:block else $else:block) => {{
4        #[cfg($meta)] 
5        let ret = $then;
6
7        #[cfg(not($meta))] 
8        let ret = $else;
9
10        ret
11    }};
12}
13
14#[allow(unused_macros)]
15#[cfg(not(feature = "rust_1_46"))]
16macro_rules! if_rust_1_46 {
17    ($(#[$attr:meta])* => ($($before_1_46:tt)*)  ($($since_1_46:tt)*)  ) => {
18        $(#[$attr])*
19        $($before_1_46)*
20    };
21}
22
23#[allow(unused_macros)]
24#[cfg(feature = "rust_1_46")]
25macro_rules! if_rust_1_46 {
26    ($(#[$attr:meta])* => ($($before_1_46:tt)*)  ($($since_1_46:tt)*)  ) => {
27        $(#[$attr])*
28        $($since_1_46)*
29    };
30}
31
32
33
34#[doc(hidden)]
35#[macro_export]
36macro_rules! __coerce_item {
37    ($item:item) => {
38        $item
39    }
40}
41
42#[doc(hidden)]
43#[macro_export]
44macro_rules! __validate_macro_then_parentheses {
45    (
46        (
47            $(::)? $($path:ident)::* ! $prefix:tt
48            ($($tokens:tt)*)
49        )
50        $($expansion:tt)*
51    ) => {
52        $($expansion)*
53    };
54    (
55        ($($anything:tt)*)
56        $($expansion:tt)*
57    ) => {
58        $crate::__::compile_error!{$crate::__::concat!{
59            "expected arguments to be a macro invocation followed by `()`-delimited arguments"
60        }}
61    };
62}