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).
84 lines
1.8 KiB
Plaintext
84 lines
1.8 KiB
Plaintext
#import "modules/std.sx";
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#import "modules/math/math.sx";
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#import "modules/compiler.sx";
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#import "modules/test.sx";
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pkg :: #import "modules/testpkg";
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add :: (a: s32, b: s32) -> s32 { a + b }
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mul :: (a: s32, b: s32) -> s32 { a * b }
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// #run compile-time constants
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CT_VAL :: #run add(10, 15);
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CT_MUL :: #run mul(6, 7);
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CT_CHAIN :: #run add(CT_VAL, 5);
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// #run compile-time optional tests
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// #run compile-time optional tests
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ct_opt_coalesce :: () -> s32 {
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x: ?s32 = 42;
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y: ?s32 = null;
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return (x ?? 0) + (y ?? 99);
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}
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ct_opt_unwrap :: () -> s32 {
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x: ?s32 = 77;
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return x!;
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}
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ct_opt_guard :: () -> s32 {
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x: ?s32 = 10;
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if x == null { return -1; }
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return x;
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}
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CT_OPT_COALESCE :: #run ct_opt_coalesce();
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CT_OPT_UNWRAP :: #run ct_opt_unwrap();
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CT_OPT_GUARD :: #run ct_opt_guard();
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// #insert helpers
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// #insert helpers
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gen_code :: () -> string {
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return "print(\"insert-ok\\n\");";
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}
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gen_val :: () -> string {
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return "print(\"insert-gen: {}\\n\", 42);";
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}
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// --- Error handling (failable functions: sets, raise/try/catch/or/onfail) ---
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main :: () {
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// ========================================================
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// 8. COMPILE-TIME
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// ========================================================
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print("=== 8. Comptime ===\n");
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// #run constant
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print("run-const: {}\n", CT_VAL);
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// #run with expression
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print("run-expr: {}\n", CT_MUL);
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// #run chained dependency
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print("run-chain: {}\n", CT_CHAIN);
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// #run comptime optionals
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print("ct-opt-coalesce: {}\n", CT_OPT_COALESCE); // ct-opt-coalesce: 141
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print("ct-opt-unwrap: {}\n", CT_OPT_UNWRAP); // ct-opt-unwrap: 77
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print("ct-opt-guard: {}\n", CT_OPT_GUARD); // ct-opt-guard: 10
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// #insert with function
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#insert gen_code();
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// #insert additional
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#insert gen_val();
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}
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