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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).
29 lines
1.0 KiB
Plaintext
29 lines
1.0 KiB
Plaintext
// Failable calls in cleanup bodies must be absorbed locally (ERR step E1.7). A
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// `defer` / `onfail` body runs while the block is already exiting, so a failable
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// it calls has nowhere to propagate — it must be handled in place with `catch`
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// or an `or <value>` terminator. This file shows the accepted forms; the bare
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// (un-absorbed) form is rejected in 1049.
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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) { raise error.Bad; }
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work :: (n: s32) -> !E {
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defer print("defer: always\n"); // plain cleanup
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onfail { failing() catch (e) print("onfail: caught (catch)\n"); } // catch absorbs
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onfail { x := recover() or 7; print("onfail: x={} (or)\n", x); } // or-value absorbs
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if n < 0 { raise error.Bad; }
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return;
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}
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main :: () -> s32 {
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print("[error]\n");
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a := work(-1); // raises → onfail bodies fire, then defer (reverse decl order)
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print("[ok]\n");
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b := work(2); // success → only defer fires
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return 0;
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}
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