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This was referenced Oct 7, 2026
gnidan
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* bugc: compile `!` as a logical not * bugc: link the changelog entry to #353 * bugc: end each source range at its last token * bugc: link the changelog entry to #362 * bugc: add block.prevrandao * bugc: link the changelog entries to #363 * bugc: hash several value-type words with keccak256 * bugc: link the changelog entries to #365 * bugc: slice a fixed-size bytes value by its bytes * bugc: link the changelog entry to #357 * bugc: hash the data of dynamic bytes and strings * bugc: link the changelog entry to #360 * bugc: give a caller's call JUMP the invoke's arguments * bugc: list variables before a function's first statement * bugc: store a memory string's bytes when assigning it to storage A storage write took its value as a word, so a memory string or bytes reference wrote its memory address into the slot. Code generation now encodes the referenced bytes as Solidity does: inline with length * 2 up to 31 bytes, else length * 2 + 1 in the slot and the data from keccak256(slot), with the last word's trailing bytes cleared. A slice now carries the bytes type, so its value is recognized too. * bugc: link the changelog entry to #355 * bugc: say why the bytes test slices without naming the copy width * bugc: copy all of a slice's bytes irgen built a slice's data as a read and a write, and a read or write moves at most one word, so only the first 32 bytes were copied. Add a copy IR instruction (CALLDATACOPY from calldata, MCOPY from memory) and emit it for the slice's data. * bugc: link the changelog entries to #359 * bugc: copy a struct read from storage into memory * bugc: link the changelog entries to #361 * bugc: lay storage arrays out as Solidity does * bugc: add push to dynamic arrays in storage
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The type checker accepts a slice of a fixed-size
bytesNvalue and gives it the typebytes, and the token-registry example uses it for selectors:keccak256("mint(uint256)")[0:4]. But irgen built every slice as a slice of dynamicbytesin memory. AbytesNvalue is a word on the stack, not a memory address, so the slice read its length from memory at an address equal to the value. Since #344 that makes the slice revert withPanic(0x32)at every optimization level; before #344 it copied whatever memory was there. With a hash of a constant string at levels 1 to 3, the folded hash is that address.A slice of a
bytesNnow has its own path in irgen. It checksstart <= end <= N, shifts bytestartof the value's N bytes up to the word's first byte, clears the bytes pastend - start, and stores the length and that word in new memory. Sokeccak256("setMotd(string)")[0:4] as bytes4is0x5fe59b9d.At level 0 that expression is still wrong for a different reason:
keccak256of dynamicbytesor astringhashes the memory address, not the data (the optimizer folds the hash of a constant string correctly at levels 1 to 3). That gets its own PR.