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.
33 lines
1.2 KiB
Plaintext
33 lines
1.2 KiB
Plaintext
// `raise` rejections (ERR step E1.3):
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// - `raise` is only valid inside a failable function,
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// - a literal `raise error.X` must name a tag in the function's set,
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// - a variable `raise e` must carry a set that is a subset of the
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// function's set.
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// The positive case lives in `examples/219-raise.sx`. Parse-time rejections
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// (`raise` in expression position / inside `defer` / `onfail`) are covered by
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// the inline parser tests.
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#import "modules/std.sx";
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ParseErr :: error { BadDigit, Overflow }
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OtherErr :: error { Weird }
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// Literal tag not in the declared set.
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bad_tag :: () -> !ParseErr {
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raise error.NotInSet; // error: NotInSet not in ParseErr
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}
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// Variable whose error set is not a subset of the function's set.
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makes_other :: () -> !OtherErr { return; }
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relay :: () -> !ParseErr {
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e := makes_other(); // e : OtherErr
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raise e; // error: OtherErr not subset of ParseErr
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}
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main :: () -> s32 {
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x := bad_tag(); // force bad_tag to lower
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y := relay(); // force relay to lower
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raise error.BadDigit; // error: main (-> s32) is not failable
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return 0;
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}
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