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).
50 lines
1.1 KiB
Plaintext
50 lines
1.1 KiB
Plaintext
Vec2 :: struct {
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x, y: f32;
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zero :: () -> Vec2 { Vec2.{ x = 0.0, y = 0.0 } }
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add :: (self: Vec2, b: Vec2) -> Vec2 {
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Vec2.{ x = self.x + b.x, y = self.y + b.y }
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}
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sub :: (self: Vec2, b: Vec2) -> Vec2 {
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Vec2.{ x = self.x - b.x, y = self.y - b.y }
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}
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scale :: (self: Vec2, s: f32) -> Vec2 {
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Vec2.{ x = self.x * s, y = self.y * s }
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}
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dot :: (self: Vec2, b: Vec2) -> f32 {
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self.x * b.x + self.y * b.y
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}
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length :: (self: Vec2) -> f32 {
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sqrt(self.x * self.x + self.y * self.y)
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}
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normalize :: (self: Vec2) -> Vec2 {
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len := self.length();
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if len > 0.0 {
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return Vec2.{ x = self.x / len, y = self.y / len };
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}
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Vec2.zero()
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}
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lerp :: (self: Vec2, b: Vec2, t: f32) -> Vec2 {
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Vec2.{ x = self.x + (b.x - self.x) * t, y = self.y + (b.y - self.y) * t }
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}
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distance :: (self: Vec2, b: Vec2) -> f32 {
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self.sub(b).length()
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}
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negate :: (self: Vec2) -> Vec2 {
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Vec2.{ x = 0.0 - self.x, y = 0.0 - self.y }
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}
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equals :: (self: Vec2, b: Vec2) -> bool {
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self.x == b.x and self.y == b.y
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}
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}
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