Comments (4)
If you want to reproduce this:
git clone https://github.com/mvdan/zstd
git checkout tmp-break-inv
./build
The HEAD commit in that branch is what replaces the number with the constant name.
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Thanks for the fix!
from wuffs.
@nigeltao playing with this new feature, I hit a fun "cannot prove" error:
check: cannot prove "i <= 131072": cannot prove "block_size <= 131072": failed at decode.wuffs:86. Facts:
max_block_size == 131072
block_size <= max_block_size
i < block_size
The code in question looks like:
var i u32
while i < block_size,
inv max_block_size == 131072,
inv block_size <= max_block_size {
assert i <= max_block_size via "a <= b: a <= c; c <= b"(c:block_size)
i += 1
}
Shouldn't this work? Or what am I missing?
from wuffs.
Ignore my comment above - I wasn't actually running the compiler on that assertion.
from wuffs.
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