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Add regression test

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This commit is contained in:
Oli Scherer 2025-07-24 08:07:56 +00:00
parent d242a8bd5a
commit 45b0c8d03e
2 changed files with 253 additions and 0 deletions
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24
tests/ui/enum-discriminant/wrapping_niche.rs Normal file
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@ -0,0 +1,24 @@
//! Test that we produce the same niche range no
//! matter of signendess if the discriminants are the same.
#![feature(rustc_attrs)]
#[repr(u16)]
#[rustc_layout(debug)]
enum UnsignedAroundZero {
//~^ ERROR: layout_of
A = 65535,
B = 0,
C = 1,
}
#[repr(i16)]
#[rustc_layout(debug)]
enum SignedAroundZero {
//~^ ERROR: layout_of
A = -1,
B = 0,
C = 1,
}
fn main() {}

229
tests/ui/enum-discriminant/wrapping_niche.stderr Normal file
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error: layout_of(UnsignedAroundZero) = Layout {
size: Size(2 bytes),
align: AbiAlign {
abi: Align(2 bytes),
},
backend_repr: Scalar(
Initialized {
value: Int(
I16,
false,
),
valid_range: 0..=65535,
},
),
fields: Arbitrary {
offsets: [
Size(0 bytes),
],
memory_index: [
0,
],
},
largest_niche: None,
uninhabited: false,
variants: Multiple {
tag: Initialized {
value: Int(
I16,
false,
),
valid_range: 0..=65535,
},
tag_encoding: Direct,
tag_field: 0,
variants: [
Layout {
size: Size(2 bytes),
align: AbiAlign {
abi: Align(2 bytes),
},
backend_repr: Memory {
sized: true,
},
fields: Arbitrary {
offsets: [],
memory_index: [],
},
largest_niche: None,
uninhabited: false,
variants: Single {
index: 0,
},
max_repr_align: None,
unadjusted_abi_align: Align(2 bytes),
randomization_seed: 9885373149222004003,
},
Layout {
size: Size(2 bytes),
align: AbiAlign {
abi: Align(2 bytes),
},
backend_repr: Memory {
sized: true,
},
fields: Arbitrary {
offsets: [],
memory_index: [],
},
largest_niche: None,
uninhabited: false,
variants: Single {
index: 1,
},
max_repr_align: None,
unadjusted_abi_align: Align(2 bytes),
randomization_seed: 9885373149222004003,
},
Layout {
size: Size(2 bytes),
align: AbiAlign {
abi: Align(2 bytes),
},
backend_repr: Memory {
sized: true,
},
fields: Arbitrary {
offsets: [],
memory_index: [],
},
largest_niche: None,
uninhabited: false,
variants: Single {
index: 2,
},
max_repr_align: None,
unadjusted_abi_align: Align(2 bytes),
randomization_seed: 9885373149222004003,
},
],
},
max_repr_align: None,
unadjusted_abi_align: Align(2 bytes),
randomization_seed: 2648004449468912780,
}
--> $DIR/wrapping_niche.rs:8:1
|
LL | enum UnsignedAroundZero {
| ^^^^^^^^^^^^^^^^^^^^^^^
error: layout_of(SignedAroundZero) = Layout {
size: Size(2 bytes),
align: AbiAlign {
abi: Align(2 bytes),
},
backend_repr: Scalar(
Initialized {
value: Int(
I16,
true,
),
valid_range: (..=1) | (65535..),
},
),
fields: Arbitrary {
offsets: [
Size(0 bytes),
],
memory_index: [
0,
],
},
largest_niche: Some(
Niche {
offset: Size(0 bytes),
value: Int(
I16,
true,
),
valid_range: (..=1) | (65535..),
},
),
uninhabited: false,
variants: Multiple {
tag: Initialized {
value: Int(
I16,
true,
),
valid_range: (..=1) | (65535..),
},
tag_encoding: Direct,
tag_field: 0,
variants: [
Layout {
size: Size(2 bytes),
align: AbiAlign {
abi: Align(2 bytes),
},
backend_repr: Memory {
sized: true,
},
fields: Arbitrary {
offsets: [],
memory_index: [],
},
largest_niche: None,
uninhabited: false,
variants: Single {
index: 0,
},
max_repr_align: None,
unadjusted_abi_align: Align(2 bytes),
randomization_seed: 2684536712112553499,
},
Layout {
size: Size(2 bytes),
align: AbiAlign {
abi: Align(2 bytes),
},
backend_repr: Memory {
sized: true,
},
fields: Arbitrary {
offsets: [],
memory_index: [],
},
largest_niche: None,
uninhabited: false,
variants: Single {
index: 1,
},
max_repr_align: None,
unadjusted_abi_align: Align(2 bytes),
randomization_seed: 2684536712112553499,
},
Layout {
size: Size(2 bytes),
align: AbiAlign {
abi: Align(2 bytes),
},
backend_repr: Memory {
sized: true,
},
fields: Arbitrary {
offsets: [],
memory_index: [],
},
largest_niche: None,
uninhabited: false,
variants: Single {
index: 2,
},
max_repr_align: None,
unadjusted_abi_align: Align(2 bytes),
randomization_seed: 2684536712112553499,
},
],
},
max_repr_align: None,
unadjusted_abi_align: Align(2 bytes),
randomization_seed: 10738146848450213996,
}
--> $DIR/wrapping_niche.rs:17:1
|
LL | enum SignedAroundZero {
| ^^^^^^^^^^^^^^^^^^^^^
error: aborting due to 2 previous errors