83ec2536af
try foo() catch (e) { } // legal
try foo() catch e { } // parse error with a migration hint
Same capture style as the for-loop. All four catch shapes keep working
with the parenthesized binding — block, bare-expression body, and the
== match sugar — and the no-binding forms are unchanged. onfail follows
the same rule (onfail (e) { }); its expression-cleanup form is
disambiguated by the paren-group-before-brace lookahead, so
onfail (f()); stays an expression cleanup.
AST unchanged; the printer renders the parens; the #run escape help
text updated. Corpus migrated (57 catch + 3 onfail bindings, in-source
parser test strings, specs incl. grammar rules, readme untouched —
no catch examples there).
Regression: examples/1157-diagnostics-catch-binding-needs-parens.sx;
re-captured stderr for 1010/1013/1037/1123 (migrated source echoed in
carets + help text).
49 lines
1.8 KiB
Plaintext
49 lines
1.8 KiB
Plaintext
// A closure literal inside a `defer` / `onfail` body is its OWN function
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// boundary (ERR step E1.7). Two boundary effects, both pinned here:
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//
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// (a) `checkCleanupNode` sees a bare lambda STATEMENT as a `.lambda` node and
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// STOPS — it does not descend into the lambda body. So the bare failable
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// inside the lambda is the lambda's concern, not a cleanup violation
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// (were the `.lambda` arm to recurse, this bare `failing()` would reject
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// like the ones in 1052).
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//
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// (b) value-slot liveness (E1.8) is analysed per-boundary: `flowExpr` recurses
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// into the lambda via `analyzeFnBody`, so a value slot read inside the
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// lambda must prove its own error absent — `v` here is live under its
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// `if !err` guard. (The rejecting counterpart is 1053.)
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//
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// Also: `try` is legal inside the lambda (it propagates through the lambda's own
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// `!E` channel) even though it is parser-banned in the cleanup body directly.
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//
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// Locks the closure-boundary arms of the error-flow pass before A5.2 extracts it
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// into its own module. Constructible since issue 0073 (closure literal in a
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// `defer` body no longer segfaults lowering — see 0310).
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#import "modules/std.sx";
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E :: error { Bad }
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failing :: () -> !E { raise error.Bad; }
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recover :: () -> (s32, !E) { return 21; }
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work :: () {
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defer {
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// (a) bare lambda statement — checkCleanupNode stops at the `.lambda`.
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() -> !E { failing(); };
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// (b) called closure — its body is analysed as its own boundary.
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emit := () -> !E {
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v, err := recover();
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if !err { print("defer closure: v={}\n", v); } // E1.8: live under guard
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try failing();
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};
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emit() catch (e) print("defer closure: raised\n");
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}
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print("body\n");
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}
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main :: () -> s32 {
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work();
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return 0;
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}
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