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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
commit | 698f8c2f01ea549d77d7dc3338a12e04c11057b9 (patch) | |
tree | 173a775858bd501c378080a10dca74132f05bc50 /src/test/ui/associated-consts/defaults-not-assumed-fail.rs | |
parent | Initial commit. (diff) | |
download | rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.tar.xz rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.zip |
Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/test/ui/associated-consts/defaults-not-assumed-fail.rs')
-rw-r--r-- | src/test/ui/associated-consts/defaults-not-assumed-fail.rs | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/src/test/ui/associated-consts/defaults-not-assumed-fail.rs b/src/test/ui/associated-consts/defaults-not-assumed-fail.rs new file mode 100644 index 000000000..3936e6a3b --- /dev/null +++ b/src/test/ui/associated-consts/defaults-not-assumed-fail.rs @@ -0,0 +1,47 @@ +// build-fail + +trait Tr { + const A: u8 = 255; + + // This should not be a constant evaluation error (overflow). The value of + // `Self::A` must not be assumed to hold inside the trait. + const B: u8 = Self::A + 1; + //~^ ERROR any use of this value will cause an error + //~| WARN this was previously accepted by the compiler but is being phased out +} + +// An impl that doesn't override any constant will NOT cause a const eval error +// just because it's defined, but only if the bad constant is used anywhere. +// This matches the behavior without defaults. +impl Tr for () {} + +// An impl that overrides either constant with a suitable value will be fine. +impl Tr for u8 { + const A: u8 = 254; +} + +impl Tr for u16 { + const B: u8 = 0; +} + +impl Tr for u32 { + const A: u8 = 254; + const B: u8 = 0; +} + +fn main() { + assert_eq!(<() as Tr>::A, 255); + assert_eq!(<() as Tr>::B, 0); // causes the error above + //~^ ERROR evaluation of constant value failed + //~| ERROR erroneous constant used + //~| WARN this was previously accepted by the compiler but is being phased out + + assert_eq!(<u8 as Tr>::A, 254); + assert_eq!(<u8 as Tr>::B, 255); + + assert_eq!(<u16 as Tr>::A, 255); + assert_eq!(<u16 as Tr>::B, 0); + + assert_eq!(<u32 as Tr>::A, 254); + assert_eq!(<u32 as Tr>::B, 0); +} |