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Make the "detect-old-time" UI test more representative

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The test code did have an inference failure, but that would have failed
on Rust 1.79 and earlier too. Now it is rewritten to be specifically
affected by 1.80's `impl FromIterator<_> for Box<str>`.
This commit is contained in:
Josh Stone 2024-08-29 13:58:43 -07:00
parent 784d444733
commit c339541f73
2 changed files with 16 additions and 8 deletions
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13
tests/ui/inference/detect-old-time-version-format_description-parse.rs
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@ -1,8 +1,13 @@
#![crate_name = "time"] #![crate_name = "time"]
#![crate_type = "lib"]
fn main() { // This code compiled without error in Rust 1.79, but started failing in 1.80
let items = Box::new(vec![]); //~ ERROR E0282 // after the addition of several `impl FromIterator<_> for Box<str>`.
pub fn parse() -> Option<Vec<()>> {
let iter = std::iter::once(Some(())).map(|o| o.map(Into::into));
let items = iter.collect::<Option<Box<_>>>()?; //~ ERROR E0282
//~^ NOTE this is an inference error on crate `time` caused by an API change in Rust 1.80.0; update `time` to version `>=0.3.35`
Some(items.into())
//~^ NOTE type must be known at this point //~^ NOTE type must be known at this point
//~| NOTE this is an inference error on crate `time` caused by an API change in Rust 1.80.0; update `time` to version `>=0.3.35`
items.into();
} }

11
tests/ui/inference/detect-old-time-version-format_description-parse.stderr
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@ -1,8 +1,11 @@
error[E0282]: type annotations needed for `Box<Vec<_>>` error[E0282]: type annotations needed for `Box<_>`
--> $DIR/detect-old-time-version-format_description-parse.rs:4:9 --> $DIR/detect-old-time-version-format_description-parse.rs:9:9
| |
LL | let items = Box::new(vec![]); LL | let items = iter.collect::<Option<Box<_>>>()?;
| ^^^^^ ---------------- type must be known at this point | ^^^^^
LL |
LL | Some(items.into())
| ---- type must be known at this point
| |
= note: this is an inference error on crate `time` caused by an API change in Rust 1.80.0; update `time` to version `>=0.3.35` by calling `cargo update` = note: this is an inference error on crate `time` caused by an API change in Rust 1.80.0; update `time` to version `>=0.3.35` by calling `cargo update`