9984fa6b96
`raise EXPR` now terminates a failable function via the error channel. Scope (Option 2): full raise sema checks + lowering for the pure-failable shape (`-> !` / `-> !Named`); the value-carrying `-> (T..., !)` shape bails loudly, deferred to E2's error-channel tuple ABI. - lowerStmt + tryLowerAsExpr: `.raise_stmt` -> lowerRaise (also routes a raise that is a block's last statement, which previously hit unknown_expr) - lowerRaise: failable-context check (effectiveReturnType + errorChannelOf); literal membership via lowerErrorTagLiteral; variable form subset-checked via checkErrorSetSubset; pure-failable emits ret(tag) - lowerErrorTagLiteral skips membership for the bare-`!` inferred placeholder - plain `return;` in a pure-failable fn emits ret(0) (success / no error) - parser: in_defer_body flag rejects `raise` inside a `defer` body Tests: examples/219-raise.sx (positive, exit 8), examples/220-raise-rejections.sx (3 sema rejections, exit 1), inline parser test for raise-in-defer. Gates: zig build, zig build test, 258/258 examples.
27 lines
1.1 KiB
Plaintext
27 lines
1.1 KiB
Plaintext
// First runnable `raise` (ERR step E1.3). A `-> !Named` (pure failable)
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// function terminates via the error channel with `raise error.X`; a plain
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// `return;` is the success exit (error slot 0). The caller binds the result
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// and inspects it with the enum-like `==`. The value-carrying `-> (T, !)`
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// shape lands with the error-channel tuple ABI in ERR phase E2.
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#import "modules/std.sx";
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ParseErr :: error { BadDigit, Overflow, Empty }
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// Pure failable: raises on bad input, otherwise succeeds (error slot 0).
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check :: (n: s32) -> !ParseErr {
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if n < 0 { raise error.BadDigit; }
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return; // success — no error
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}
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main :: () -> s32 {
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good := check(7); // success path -> no error
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bad := check(-1); // raise path -> BadDigit
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r : s32 = 0;
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if bad == error.BadDigit { r = r + 8; } // true -> +8
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if good == error.BadDigit { r = r + 1; } // false (success = no error)
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if bad == error.Overflow { r = r + 2; } // false (raised BadDigit)
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print("raise result: {}\n", r); // -> 8
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return r;
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}
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