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).
28 lines
838 B
Plaintext
28 lines
838 B
Plaintext
// A braced `defer { … }` body parses as a full statement block (like `onfail`),
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// so it supports every statement form — a destructure decl, a `catch`-statement,
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// nested var decls — not just a single bare expression. Previously `defer { … }`
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// routed through the expression parser and rejected those with "expected ';'".
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//
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// Regression (issue 0065).
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#import "modules/std.sx";
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E :: error { Bad }
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probe :: () -> (s32, !E) { return 21; }
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failing :: () -> !E { raise error.Bad; }
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run :: () {
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defer {
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v, e := probe(); // destructure decl
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if !e { print("defer: v={}\n", v); } // value live under the guard
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failing() catch (x) print("defer: caught\n"); // catch-statement absorbs
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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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run();
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return 0;
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}
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