b113e03fa3
Two more E5.1 composition pieces: - inferExprType .call: a callee that's a local variable of bare type () now resolves to its declared return type (only was handled before), so / on the call see the failable result instead of . - createClosureToBareFnAdapter now widens: when a NON-failable closure literal flows into a failable bare slot (∅ ⊆ slot set, success type matches), the adapter wraps the value into the slot's tuple via lowerFailableSuccessReturn — previously rejected. The failable->non-failable and capturing->bare crossings stay rejected. Adapter generation fires for closure LITERALS flowing into a bare-fn slot; a pre-bound closure VARIABLE into a bare-fn slot is a separate coercion-site path, still unhandled (noted in CHECKPOINT-ERR). Regression: examples/1040-errors-failable-closure-composition. Suite: 329 passed.
35 lines
1.7 KiB
Plaintext
35 lines
1.7 KiB
Plaintext
// Failable closure composition (ERR E5.1): a closure LITERAL passed as a
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// function-type argument and called inside the callee. Covers a bare failable
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// fn-type param (`cb: (T) -> (U, !)`), the idiomatic `Closure(...)` param
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// (try-propagated), and ∅-widening of a NON-failable closure literal into a
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// failable slot (the generated adapter wraps the value into `{value, 0}`).
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//
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// NOTE: the adapter is generated when the closure LITERAL flows directly into
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// the bare-fn slot. Passing a pre-bound closure *variable* into a bare-fn slot
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// is a separate coercion-site path, not yet handled — see CHECKPOINT-ERR.
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#import "modules/std.sx";
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E :: error { Neg }
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bare :: (cb: (s64) -> (s64, !E), n: s64) -> s64 { return cb(n) catch e -1; }
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chain :: (cb: Closure(s64) -> (s64, !E), n: s64) -> (s64, !E) { return try cb(n); }
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dbl :: (x: s64) -> (s64, !E) { if x < 0 { raise error.Neg; } return x * 2; }
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main :: () -> s32 {
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// failable closure literal through a bare fn-type param (matching ABI)
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print("bare ok={} err={}\n",
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bare(closure((x: s64) -> (s64, !E) { if x < 0 { raise error.Neg; } return x * 2; }), 5),
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bare(closure((x: s64) -> (s64, !E) => x * 2), -1)); // ok=10; err: arrow never raises → cb(-1) = -2
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// Closure(...) param, try-propagated, then caught at the call site
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print("chain ok={} err={}\n",
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chain(closure((x: s64) -> (s64, !E) => x + 6), 4) catch e 0, // 10
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chain(closure((x: s64) -> (s64, !E) { raise error.Neg; }), 1) catch e 0); // 0
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// NON-failable closure literal widened into the failable bare slot
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print("widen={}\n", bare(closure((x: s64) -> s64 => x + 1), 9)); // 10
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return 0;
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}
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