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If a type is incomplete, for example if generic parameters are not available yet, although they are not escaping, its layout may not be computable. Calling `TyCtxt::layout_of()` would create a delayed bug in the compiler.
105 lines
2.4 KiB
Rust
105 lines
2.4 KiB
Rust
#![warn(clippy::zero_sized_map_values)]
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use std::collections::HashMap;
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const CONST_OK: Option<HashMap<String, usize>> = None;
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const CONST_NOT_OK: Option<HashMap<String, ()>> = None;
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//~^ zero_sized_map_values
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static STATIC_OK: Option<HashMap<String, usize>> = None;
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static STATIC_NOT_OK: Option<HashMap<String, ()>> = None;
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//~^ zero_sized_map_values
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type OkMap = HashMap<String, usize>;
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type NotOkMap = HashMap<String, ()>;
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//~^ zero_sized_map_values
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enum TestEnum {
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Ok(HashMap<String, usize>),
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NotOk(HashMap<String, ()>),
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//~^ zero_sized_map_values
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}
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struct Test {
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ok: HashMap<String, usize>,
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not_ok: HashMap<String, ()>,
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//~^ zero_sized_map_values
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also_not_ok: Vec<HashMap<usize, ()>>,
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//~^ zero_sized_map_values
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}
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trait TestTrait {
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type Output;
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fn produce_output() -> Self::Output;
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fn weird_map(&self, map: HashMap<usize, ()>);
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//~^ zero_sized_map_values
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}
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impl Test {
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fn ok(&self) -> HashMap<String, usize> {
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todo!()
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}
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fn not_ok(&self) -> HashMap<String, ()> {
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//~^ zero_sized_map_values
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todo!()
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}
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}
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impl TestTrait for Test {
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type Output = HashMap<String, ()>;
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fn produce_output() -> Self::Output {
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todo!();
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}
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fn weird_map(&self, map: HashMap<usize, ()>) {
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todo!();
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}
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}
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fn test(map: HashMap<String, ()>, key: &str) -> HashMap<String, ()> {
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//~^ zero_sized_map_values
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//~| zero_sized_map_values
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todo!();
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}
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fn test2(map: HashMap<String, usize>, key: &str) -> HashMap<String, usize> {
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todo!();
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}
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fn issue14822() {
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trait Trait {
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type T;
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}
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struct S<T: Trait>(T::T);
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// The `delay_bug` happens when evaluating the pointer metadata of `S<T>` which depends on
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// whether `T::T` is `Sized`. Since the type alias doesn't have a trait bound of `T: Trait`
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// evaluating `T::T: Sized` ultimately fails with `NoSolution`.
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type A<T> = HashMap<u32, *const S<T>>;
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type B<T> = HashMap<u32, S<T>>;
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enum E {}
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impl Trait for E {
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type T = ();
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}
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type C = HashMap<u32, *const S<E>>;
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type D = HashMap<u32, S<E>>;
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//~^ zero_sized_map_values
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}
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fn main() {
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let _: HashMap<String, ()> = HashMap::new();
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//~^ zero_sized_map_values
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//~| zero_sized_map_values
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let _: HashMap<String, usize> = HashMap::new();
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let _: HashMap<_, _> = std::iter::empty::<(String, ())>().collect();
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//~^ zero_sized_map_values
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}
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