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).
26 lines
1012 B
Plaintext
26 lines
1012 B
Plaintext
// Phase 0 baseline (PLAN-FFI.md step 0.7): `#import c { #include /
|
|
// #source }` end-to-end, with the new stdlib-path resolution
|
|
// (src/imports.zig added this session). The header + .c live ONLY
|
|
// under `library/vendors/sx_ffi_resolve_test/` — not the sx repo
|
|
// root vendors/ — so the path can be found only by the stdlib
|
|
// search branch (`<exe>/../../library` etc.), not by the CWD or
|
|
// importing-file's-dir branches.
|
|
//
|
|
// `#include` triggers c_import.zig's auto-synthesis of `#foreign`
|
|
// fn decls from the C header; `#source` adds the .c to the build's
|
|
// object list. Together they let the sx side call the C functions
|
|
// by their declared names with no manual decls.
|
|
|
|
#import "modules/std.sx";
|
|
|
|
#import c {
|
|
#include "vendors/sx_ffi_resolve_test/sx_ffi_resolve_test.h";
|
|
#source "vendors/sx_ffi_resolve_test/sx_ffi_resolve_test.c";
|
|
};
|
|
|
|
main :: () -> s32 {
|
|
print("add(3, 4) = {}\n", sx_ffi_resolve_test_add(3, 4));
|
|
print("mul(6, 7) = {}\n", sx_ffi_resolve_test_mul(6, 7));
|
|
0
|
|
}
|