59 lines
1.3 KiB
Rust
59 lines
1.3 KiB
Rust
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//@ run-pass
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#![allow(dead_code, non_camel_case_types, non_upper_case_globals)]
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#![feature(macro_metavar_expr_concat)]
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macro_rules! create_things {
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($lhs:ident) => {
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struct ${concat($lhs, _separated_idents_in_a_struct)} {
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foo: i32,
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${concat($lhs, _separated_idents_in_a_field)}: i32,
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}
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mod ${concat($lhs, _separated_idents_in_a_module)} {
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pub const FOO: () = ();
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}
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fn ${concat($lhs, _separated_idents_in_a_fn)}() {}
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};
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}
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macro_rules! many_idents {
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($a:ident, $c:ident) => {
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const ${concat($a, B, $c, D)}: i32 = 1;
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};
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}
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macro_rules! valid_tts {
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($_0:tt, $_1:tt) => {
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const ${concat($_0, $_1)}: i32 = 1;
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}
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}
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macro_rules! without_dollar_sign_is_an_ident {
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($ident:ident) => {
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const ${concat(VAR, ident)}: i32 = 1;
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const ${concat(VAR, $ident)}: i32 = 2;
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};
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}
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fn main() {
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create_things!(behold);
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behold_separated_idents_in_a_fn();
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let _ = behold_separated_idents_in_a_module::FOO;
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let _ = behold_separated_idents_in_a_struct {
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foo: 1,
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behold_separated_idents_in_a_field: 2,
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};
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many_idents!(A, C);
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assert_eq!(ABCD, 1);
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valid_tts!(X, YZ);
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assert_eq!(XYZ, 1);
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without_dollar_sign_is_an_ident!(_123);
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assert_eq!(VARident, 1);
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assert_eq!(VAR_123, 2);
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}
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