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).
42 lines
1.3 KiB
Plaintext
42 lines
1.3 KiB
Plaintext
// Chained foreign-class method dispatch: `Cls.static().instance(...)`
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// resolves the inner call's return type so the outer dispatch's
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// receiver type is known. Pre-fix this collapsed to s64 in
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// `inferExprType`, the foreign_class_map lookup missed, and lowering
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// emitted `error: unresolved 'init'` (or 'initWithWindowScene' etc.)
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// — see issues/0043 for the chess uikit.sx C4 migration that hit it.
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//
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// Two return-type shapes covered: explicit `*ClassName` (alloc here)
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// and `*Self` (init). Both must propagate through the chain so the
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// next `.method(...)` finds the foreign-class declaration.
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#import "modules/std.sx";
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#import "modules/compiler.sx";
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NSObject :: #foreign #objc_class("NSObject") {
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alloc :: () -> *NSObject;
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init :: (self: *Self) -> *Self;
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}
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NSObjectSelfReturn :: #foreign #objc_class("NSObject") {
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alloc :: () -> *Self;
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init :: (self: *Self) -> *Self;
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}
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main :: () -> s32 {
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inline if OS == .macos {
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a := NSObject.alloc().init();
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if a != null {
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print("explicit-then-self ok\n");
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}
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b := NSObjectSelfReturn.alloc().init();
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if b != null {
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print("self-then-self ok\n");
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}
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}
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inline if OS != .macos {
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print("explicit-then-self ok\n");
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print("self-then-self ok\n");
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}
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0
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}
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