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RalfJungRalfJung
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add test
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‎src/test/ui/consts/miri_unleashed/enum_discriminants.rs

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// compile-flags: -Zunleash-the-miri-inside-of-you
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// run-pass
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//! Make sure that we read and write enum discriminants correctly for corner cases caused
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//! by layout optimizations.
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const OVERFLOW: usize = {
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// Tests for https://github.com/rust-lang/rust/issues/62138.
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#[repr(u8)]
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#[allow(dead_code)]
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enum WithWraparoundInvalidValues {
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X = 1,
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Y = 254,
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}
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#[allow(dead_code)]
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enum Foo {
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A,
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B,
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C(WithWraparoundInvalidValues),
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}
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let x = Foo::B;
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match x {
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Foo::B => 0,
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_ => panic!(),
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}
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};
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const MORE_OVERFLOW: usize = {
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pub enum Infallible {}
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// The check that the `bool` field of `V1` is encoding a "niche variant"
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// (i.e. not `V1`, so `V3` or `V4`) used to be mathematically incorrect,
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// causing valid `V1` values to be interpreted as other variants.
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#[allow(dead_code)]
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pub enum E1 {
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V1 { f: bool },
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V2 { f: Infallible },
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V3,
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V4,
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}
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// Computing the discriminant used to be done using the niche type (here `u8`,
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// from the `bool` field of `V1`), overflowing for variants with large enough
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// indices (`V3` and `V4`), causing them to be interpreted as other variants.
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#[allow(dead_code)]
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pub enum E2<X> {
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V1 { f: bool },
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/*_00*/ _01(X), _02(X), _03(X), _04(X), _05(X), _06(X), _07(X),
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_08(X), _09(X), _0A(X), _0B(X), _0C(X), _0D(X), _0E(X), _0F(X),
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_10(X), _11(X), _12(X), _13(X), _14(X), _15(X), _16(X), _17(X),
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_18(X), _19(X), _1A(X), _1B(X), _1C(X), _1D(X), _1E(X), _1F(X),
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_20(X), _21(X), _22(X), _23(X), _24(X), _25(X), _26(X), _27(X),
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_28(X), _29(X), _2A(X), _2B(X), _2C(X), _2D(X), _2E(X), _2F(X),
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_30(X), _31(X), _32(X), _33(X), _34(X), _35(X), _36(X), _37(X),
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_38(X), _39(X), _3A(X), _3B(X), _3C(X), _3D(X), _3E(X), _3F(X),
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_40(X), _41(X), _42(X), _43(X), _44(X), _45(X), _46(X), _47(X),
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_48(X), _49(X), _4A(X), _4B(X), _4C(X), _4D(X), _4E(X), _4F(X),
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_50(X), _51(X), _52(X), _53(X), _54(X), _55(X), _56(X), _57(X),
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_58(X), _59(X), _5A(X), _5B(X), _5C(X), _5D(X), _5E(X), _5F(X),
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_60(X), _61(X), _62(X), _63(X), _64(X), _65(X), _66(X), _67(X),
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_68(X), _69(X), _6A(X), _6B(X), _6C(X), _6D(X), _6E(X), _6F(X),
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_70(X), _71(X), _72(X), _73(X), _74(X), _75(X), _76(X), _77(X),
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_78(X), _79(X), _7A(X), _7B(X), _7C(X), _7D(X), _7E(X), _7F(X),
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_80(X), _81(X), _82(X), _83(X), _84(X), _85(X), _86(X), _87(X),
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_88(X), _89(X), _8A(X), _8B(X), _8C(X), _8D(X), _8E(X), _8F(X),
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_90(X), _91(X), _92(X), _93(X), _94(X), _95(X), _96(X), _97(X),
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_98(X), _99(X), _9A(X), _9B(X), _9C(X), _9D(X), _9E(X), _9F(X),
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_A0(X), _A1(X), _A2(X), _A3(X), _A4(X), _A5(X), _A6(X), _A7(X),
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_A8(X), _A9(X), _AA(X), _AB(X), _AC(X), _AD(X), _AE(X), _AF(X),
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_B0(X), _B1(X), _B2(X), _B3(X), _B4(X), _B5(X), _B6(X), _B7(X),
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_B8(X), _B9(X), _BA(X), _BB(X), _BC(X), _BD(X), _BE(X), _BF(X),
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_C0(X), _C1(X), _C2(X), _C3(X), _C4(X), _C5(X), _C6(X), _C7(X),
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_C8(X), _C9(X), _CA(X), _CB(X), _CC(X), _CD(X), _CE(X), _CF(X),
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_D0(X), _D1(X), _D2(X), _D3(X), _D4(X), _D5(X), _D6(X), _D7(X),
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_D8(X), _D9(X), _DA(X), _DB(X), _DC(X), _DD(X), _DE(X), _DF(X),
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_E0(X), _E1(X), _E2(X), _E3(X), _E4(X), _E5(X), _E6(X), _E7(X),
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_E8(X), _E9(X), _EA(X), _EB(X), _EC(X), _ED(X), _EE(X), _EF(X),
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_F0(X), _F1(X), _F2(X), _F3(X), _F4(X), _F5(X), _F6(X), _F7(X),
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_F8(X), _F9(X), _FA(X), _FB(X), _FC(X), _FD(X), _FE(X), _FF(X),
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V3,
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V4,
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}
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if let E1::V2 { .. } = (E1::V1 { f: true }) {
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unreachable!()
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}
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if let E1::V1 { .. } = (E1::V1 { f: true }) {
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} else {
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unreachable!()
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}
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if let E2::V1 { .. } = E2::V3::<Infallible> {
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unreachable!()
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}
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if let E2::V3 { .. } = E2::V3::<Infallible> {
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} else {
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unreachable!()
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}
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0
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};
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fn main() {
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assert_eq!(OVERFLOW, 0);
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assert_eq!(MORE_OVERFLOW, 0);
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}

‎src/test/ui/consts/miri_unleashed/enum_discriminants.stderr

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warning: skipping const checks
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--> $DIR/enum_discriminants.rs:23:13
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|
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LL | let x = Foo::B;
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| ^^^^^^
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warning: skipping const checks
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--> $DIR/enum_discriminants.rs:25:9
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|
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LL | Foo::B => 0,
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| ^^^^^^
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warning: skipping const checks
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--> $DIR/enum_discriminants.rs:88:28
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|
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LL | if let E1::V2 { .. } = (E1::V1 { f: true }) {
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| ^^^^^^^^^^^^^^^^^^^^
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warning: skipping const checks
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--> $DIR/enum_discriminants.rs:88:12
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|
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LL | if let E1::V2 { .. } = (E1::V1 { f: true }) {
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| ^^^^^^^^^^^^^
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warning: skipping const checks
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--> $DIR/enum_discriminants.rs:108:5
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|
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LL | assert_eq!(OVERFLOW, 0);
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| ^^^^^^^^^^^^^^^^^^^^^^^^
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|
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= note: this warning originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
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warning: skipping const checks
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--> $DIR/enum_discriminants.rs:108:5
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|
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LL | assert_eq!(OVERFLOW, 0);
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| ^^^^^^^^^^^^^^^^^^^^^^^^
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|
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= note: this warning originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
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warning: skipping const checks
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--> $DIR/enum_discriminants.rs:108:5
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|
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LL | assert_eq!(OVERFLOW, 0);
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| ^^^^^^^^^^^^^^^^^^^^^^^^
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|
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= note: this warning originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
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warning: skipping const checks
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--> $DIR/enum_discriminants.rs:109:5
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|
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LL | assert_eq!(MORE_OVERFLOW, 0);
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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|
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= note: this warning originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
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warning: skipping const checks
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--> $DIR/enum_discriminants.rs:109:5
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|
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LL | assert_eq!(MORE_OVERFLOW, 0);
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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|
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= note: this warning originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
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warning: skipping const checks
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--> $DIR/enum_discriminants.rs:109:5
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|
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LL | assert_eq!(MORE_OVERFLOW, 0);
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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|
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= note: this warning originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
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