bdd0e96d78
A block's value is now its last statement ONLY when that statement is a trailing expression with no `;`. A trailing `;` discards the value, leaving the block void. This makes value-vs-statement explicit and lets the compiler reject "this block was supposed to produce a value". Compiler: - Parser records `Block.produces_value` (last stmt is a no-`;` trailing expression) + `Block.discarded_semi` (the `;` that discarded a value), via `expectSemicolonAfter`. A trailing expression before `}` may now omit its `;` (previously a parse error). Match-arm and else-arm bodies are built value-producing regardless of the arm `;` (arms are exempt — the `;` is an arm terminator). - Lowering: `lowerBlockValue` / the block-expr path / `inferExprType` respect `produces_value`. A value-position block that discards its value is a hard error (`lowerValueBody` for function bodies; the value-context `.block` path for if/else branches, `catch` bodies, value bindings, match arms). Pure-failable `-> !` bodies (value rides the error channel) and a value-if whose branches are void are handled without false errors. - `defer`/`onfail` cleanup bodies lower as statements (void), so a trailing `;` there is fine. Migration (behavior-preserving — output unchanged): - stdlib + ~210 examples: dropped the trailing `;` on value-position last expressions. `format` now ends with an explicit `#insert "return result;"` (it relied on `#insert`-as-block-value, which `;` discards). - Two `main :: () -> s32` examples that relied on the old silent default-return got an explicit trailing `0`. - Rejection snapshots 0412 / 1013 regenerated (their quoted source lines lost a `;`); the diagnostics themselves are unchanged. Docs/tests: specs.md "Block values" section; examples 0040 (rules) + 0041 (rejection); 3 parser unit tests. Filed issue 0066 (pre-existing match-arm negated-literal phi-width quirk, surfaced not caused here). Gates: zig build, zig build test, run_examples.sh -> 343 passed, cross_compile.sh -> 7 passed (also refreshed its stale example names).
34 lines
1.1 KiB
Plaintext
34 lines
1.1 KiB
Plaintext
// POSIX socket module (macOS only)
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// sockaddr_in layout and constants are platform-specific.
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libc :: #library "c";
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// POSIX socket API
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socket :: (domain: s32, kind: s32, protocol: s32) -> s32 #foreign libc;
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setsockopt :: (fd: s32, level: s32, optname: s32, optval: *s32, optlen: u32) -> s32 #foreign libc;
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bind :: (fd: s32, addr: *SockAddr, addrlen: u32) -> s32 #foreign libc;
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listen :: (fd: s32, backlog: s32) -> s32 #foreign libc;
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accept :: (fd: s32, addr: *SockAddr, addrlen: *u32) -> s32 #foreign libc;
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read :: (fd: s32, buf: [*]u8, count: usize) -> isize #foreign libc;
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write :: (fd: s32, buf: [*]u8, count: usize) -> isize #foreign libc;
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close :: (fd: s32) -> s32 #foreign libc;
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// Constants (macOS)
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AF_INET :s32: 2;
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SOCK_STREAM :s32: 1;
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SOL_SOCKET :s32: 0xFFFF;
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SO_REUSEADDR :s32: 0x4;
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// macOS sockaddr_in (16 bytes, has sin_len field)
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SockAddr :: struct {
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sin_len: u8;
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sin_family: u8;
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sin_port: u16;
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sin_addr: u32 = 0;
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sin_zero: u64 = 0;
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}
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htons :: (port: s64) -> u16 {
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cast(u16) (((port & 0xFF) << 8) | ((port >> 8) & 0xFF))
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}
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