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.
41 lines
1.3 KiB
Plaintext
41 lines
1.3 KiB
Plaintext
// Whole-program inferred error sets (ERR step E1.4b). A bare `-> !` function's
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// error set is INFERRED: the union of the tags it raises directly plus the
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// sets of the failable functions it `try`s, converged across the whole call
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// graph by a fix-point pass. Here `leaf` raises {Foo}; `mid` try-propagates
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// leaf AND raises Bar, so `mid` converges to {Foo, Bar}; the named caller
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// `run :: -> !A` then type-checks because mid's converged set is a subset of
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// A. The rejection (a converged tag NOT in the caller's set) lives in
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// `examples/224-inferred-widening-reject.sx`.
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#import "modules/std.sx";
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A :: error { Foo, Bar }
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leaf :: (n: i32) -> ! {
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if n < 0 { raise error.Foo; }
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return;
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}
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// Inferred set converges to {Foo, Bar}: {Foo} absorbed from `try leaf` plus
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// the directly-raised Bar.
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mid :: (n: i32) -> ! {
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try leaf(n);
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if n == 100 { raise error.Bar; }
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return;
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}
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// Named caller: mid's converged {Foo, Bar} is a subset of A -> widening OK.
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run :: (n: i32) -> !A {
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try mid(n);
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return;
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}
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main :: () -> i32 {
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e := run(-1); // leaf raises Foo -> propagates out
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r : i32 = 0;
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if e == error.Foo { r = r + 7; } // true -> +7
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if e == error.Bar { r = r + 1; } // false (Foo escaped, not Bar)
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print("inferred result: {}\n", r); // -> 7
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return r;
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}
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