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).
31 lines
1.1 KiB
Plaintext
31 lines
1.1 KiB
Plaintext
// `Alias.new(args)` constructor dispatch on a `#foreign #jni_class`
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// (chess-on-Pixel migration, R.6). The sx-side `static new :: (...) ->
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// *Self;` member lowers to JNI `FindClass + GetMethodID("<init>", sig)
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// + NewObject(env, clazz, mid, args...)`.
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//
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// This smoke instantiates a `SurfaceView` from inside the Activity's
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// `onCreate` body — chess's render surface starts the same way.
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#import "modules/std.sx";
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#import "modules/compiler.sx";
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Bundle :: #foreign #jni_class("android/os/Bundle") { }
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JContext :: #foreign #jni_class("android/content/Context") { }
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SurfaceView :: #foreign #jni_class("android/view/SurfaceView") {
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new :: (ctx: *JContext) -> *Self; // no `self: *Self` → class method
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}
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g_held_view : *void = null;
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SxApp :: #jni_main #jni_class("co/swipelab/sxjnictor/SxApp") {
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onCreate :: (self: *Self, b: *Bundle) {
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super.onCreate(b);
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ctx : *JContext = xx self; // Activity IS a JContext (extends JContext).
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view := SurfaceView.new(ctx);
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g_held_view = xx view; // keep alive so LLVM doesn't DCE the construction.
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}
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}
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main :: () -> s32 { 0 }
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