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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).
15 lines
348 B
Plaintext
15 lines
348 B
Plaintext
// The catch error binding is parenthesized — `catch (e) { }`; a bare
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// binding is rejected with a migration hint. (Same rule as the for-loop
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// capture; `onfail (e) { }` follows it too.)
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#import "modules/std.sx";
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E :: error { Bad };
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f :: () -> (s64, !E) { raise error.Bad; }
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main :: () {
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v := f() catch e { 0 };
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print("{}\n", v);
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}
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