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https://github.com/rust-lang/rust
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52 lines
1.2 KiB
Rust
52 lines
1.2 KiB
Rust
//@ compile-flags: -Z print-type-sizes --crate-type=lib
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//@ build-pass
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//@ ignore-pass
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// ^-- needed because `--pass check` does not emit the output needed.
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// FIXME: consider using an attribute instead of side-effects.
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// This file illustrates how generics are handled: types have to be
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// monomorphized, in the MIR of the original function in which they
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// occur, to have their size reported.
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#[derive(Copy, Clone)]
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pub struct Pair<T> {
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_car: T,
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_cdr: T,
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}
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impl<T> Pair<T> {
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fn new(a: T, d: T) -> Self {
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Pair {
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_car: a,
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_cdr: d,
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}
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}
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}
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#[derive(Copy, Clone)]
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pub struct SevenBytes([u8; 7]);
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pub struct FiftyBytes([u8; 50]);
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pub struct ZeroSized;
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impl SevenBytes {
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fn new() -> Self { SevenBytes([0; 7]) }
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}
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impl FiftyBytes {
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fn new() -> Self { FiftyBytes([0; 50]) }
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}
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pub fn f1<T:Copy>(x: T) {
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let _v: Pair<T> = Pair::new(x, x);
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let _v2: Pair<FiftyBytes> =
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Pair::new(FiftyBytes::new(), FiftyBytes::new());
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}
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pub fn start() {
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let _b: Pair<u8> = Pair::new(0, 0);
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let _s: Pair<SevenBytes> = Pair::new(SevenBytes::new(), SevenBytes::new());
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let ref _z: ZeroSized = ZeroSized;
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f1::<SevenBytes>(SevenBytes::new());
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}
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