mirror of https://github.com/rust-lang/rust
62 lines
1.4 KiB
Rust
62 lines
1.4 KiB
Rust
#![feature(concat_idents)]
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#![allow(nonstandard_style)]
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/// Generate 250 items that all match the query, starting with the longest.
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/// Those long items should be dropped from the result set, and the short ones
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/// should be shown instead.
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macro_rules! generate {
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([$($x:ident),+], $y:tt, $z:tt) => {
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$(
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generate!(@ $x, $y, $z);
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)+
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};
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(@ $x:ident , [$($y:ident),+], $z:tt) => {
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pub struct $x;
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$(
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generate!(@@ $x, $y, $z);
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)+
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};
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(@@ $x:ident , $y:ident, [$($z:ident: $zt:ident),+]) => {
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impl $y {
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pub fn $x($($z: $zt,)+) {}
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}
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}
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}
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pub struct First;
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pub struct Second;
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pub struct Third;
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pub struct Fourth;
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pub struct Fifth;
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generate!(
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[a, b, c, d, e],
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[a, b, c, d, e, f, g, h, i, j],
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[a: First, b: Second, c: Third, d: Fourth, e: Fifth]
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);
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generate!(
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[f, g, h, i, j],
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[a, b, c, d, e, f, g, h, i, j],
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[a: First, b: Second, c: Third, d: Fourth]
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);
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generate!(
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[k, l, m, n, o],
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[a, b, c, d, e, f, g, h, i, j],
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[a: First, b: Second, c: Third]
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);
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generate!(
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// reverse it, just to make sure they're alphabetized
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// in the result set when all else is equal
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[t, s, r, q, p],
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[a, b, c, d, e, f, g, h, i, j],
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[a: First, b: Second]
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);
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generate!(
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[u, v, w, x, y],
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[a, b, c, d, e, f, g, h, i, j],
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[a: First]
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);
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