66bdc70bf1
Move examples/*.sx and their expected/ snapshots into per-category subfolders (examples/<category>/...). Folder = leading filename token, with ffi-objc/ffi-jni kept whole; filenames are unchanged. The corpus runner and LSP sweep now discover each category's expected/ dir, while issues/ stays flat. Example 1058's repo-root-relative companion import is made file-relative. Path strings embedded in 164 snapshots were regenerated (path-only changes). Test-layout docs in CLAUDE.md updated.
25 lines
1.2 KiB
Plaintext
25 lines
1.2 KiB
Plaintext
// Failable closure literals (ERR E5.1): a `closure(...)` literal may declare a
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// failable return type — `-> (T, !)` / `-> !Named` — in both block and arrow
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// body forms, and `raise` inside. Called directly through the bound local, the
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// error channel is consumed by `catch` / `or`; passed as a `Closure(...)`
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// parameter, it composes through the callee (here absorbed with `catch`).
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// (A capturing closure into a bare `(T)->U` slot, and a failable closure into a
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// non-failable slot, are rejected — see issue 0060 / the FFI-boundary rule.)
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#import "modules/std.sx";
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E :: error { Neg }
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runwith :: (cb: Closure(i64) -> (i64, !E), n: i64) -> i64 { return cb(n) catch (e) -1; }
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main :: () -> i32 {
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// block-body and arrow-body failable closures, called directly
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m := closure((x: i64) -> (i64, !E) { if x < 0 { raise error.Neg; } return x * 2; });
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n := closure((x: i64) -> (i64, !E) => x + 1);
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print("{} {} {} {}\n", m(5) catch (e) 0, m(-1) catch (e) 99, m(-1) or 7, n(40) catch (e) 0); // 10 99 7 41
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// failable closure passed as a Closure(...) parameter
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print("param ok={} err={}\n", runwith(m, 5), runwith(m, -1)); // 10 -1
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return 0;
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}
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