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).
29 lines
868 B
Plaintext
29 lines
868 B
Plaintext
// A reserved/builtin type name is rejected as the error-tag binding of a
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// `catch` (`u8`) and of an `onfail` (`s64`). Both are reached through the
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// exhaustive binding-name walk's `catch_expr` / `onfail_stmt` arms. The tag is
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// a scalar, so before the diagnostic these spellings were silently accepted
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// (they never reached the address-of mis-lowering) — the binding must still be
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// rejected at its declaration.
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//
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// Regression (issue 0076, attempt-4 coverage). Expected: one error for each
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// binding; exit 1.
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#import "modules/std.sx";
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E :: error { Bad }
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must :: (n: s32) -> !E {
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if n < 0 { raise error.Bad; }
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return;
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}
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classify :: (n: s32) -> !E {
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onfail (s64) { } // onfail tag binding
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must(n) catch (u8) { return; }; // catch tag binding
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return;
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}
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main :: () -> s32 {
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classify(-1) catch { };
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return 0;
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}
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