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Better error messages when collecting into [T; n]

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This commit is contained in:
Michael Goulet 2022-04-26 21:09:26 -07:00
parent a7197189cd
commit 83d701e569
6 changed files with 69 additions and 32 deletions
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32
library/core/src/iter/traits/collect.rs
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@ -96,30 +96,24 @@
#[rustc_on_unimplemented(
on(
_Self = "[{A}]",
message = "a value of type `{Self}` cannot be built since `{Self}` has no definite size",
message = "a slice of type `{Self}` cannot be built since `{Self}` has no definite size",
label = "try explicitly collecting into a `Vec<{A}>`",
),
on(
all(
A = "{integer}",
any(
_Self = "[i8]",
_Self = "[i16]",
_Self = "[i32]",
_Self = "[i64]",
_Self = "[i128]",
_Self = "[isize]",
_Self = "[u8]",
_Self = "[u16]",
_Self = "[u32]",
_Self = "[u64]",
_Self = "[u128]",
_Self = "[usize]"
)
),
message = "a value of type `{Self}` cannot be built since `{Self}` has no definite size",
all(A = "{integer}", any(_Self = "[{integral}]",)),
message = "a slice of type `{Self}` cannot be built since `{Self}` has no definite size",
label = "try explicitly collecting into a `Vec<{A}>`",
),
on(
_Self = "[{A}; _]",
message = "an array of type `{Self}` cannot be built directly from an iterator",
label = "try collecting into a `Vec<{A}>`, then using `.try_into()`",
),
on(
all(A = "{integer}", any(_Self = "[{integral}; _]",)),
message = "an array of type `{Self}` cannot be built directly from an iterator",
label = "try collecting into a `Vec<{A}>`, then using `.try_into()`",
),
message = "a value of type `{Self}` cannot be built from an iterator \
over elements of type `{A}`",
label = "value of type `{Self}` cannot be built from `std::iter::Iterator<Item={A}>`"