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).
45 lines
850 B
Plaintext
45 lines
850 B
Plaintext
#import "modules/std.sx";
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math :: #import "modules/math";
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dot :: (a: Vector(3,f32), b: Vector(3,f32)) -> f32 {
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a.x*b.x + a.y*b.y + a.z*b.z
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}
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cross :: (a: Vector(3,f32), b: Vector(3,f32)) -> Vector(3,f32) {
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.[a.y*b.z - a.z*b.y, a.z*b.x - a.x*b.z, a.x*b.y - a.y*b.x]
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}
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length :: (v: Vector(3,f32)) -> f32 {
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math.sqrt(dot(v, v))
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}
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normalize :: (v: Vector(3,f32)) -> Vector(3,f32) {
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v / length(v)
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}
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vec3 :: (x:f32, y:f32, z:f32) -> Vector(3,f32) {
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.[x, y, z]
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}
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main :: () {
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a := vec3(1, 0, 0);
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b := vec3(0, 1, 0);
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// dot product
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d := dot(a, b);
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print("dot: {}\n", d);
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// cross product
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cr := cross(a, b);
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print("cross: {}\n", cr);
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// length
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v := vec3(3, 4, 0);
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len := length(v);
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print("length: {}\n", len);
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// normalize
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n := normalize(v);
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print("norm: {}\n", n);
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}
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