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).
27 lines
1.0 KiB
Plaintext
27 lines
1.0 KiB
Plaintext
// Cleanup-body control-flow restrictions (ERR step E1.7 follow-up). A `defer`
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// or `onfail` body runs while the block/function is already exiting, so it has
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// no target to transfer control to: `raise` / `try` / `return` / `break` /
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// `continue` are all rejected inside one. The ban is transitive through nested
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// `catch` bodies and loops, but NOT through a nested closure (its own function
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// boundary). `raise` was already banned (E1.3); this adds the other four.
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// This file is expected to FAIL compilation (exit 1).
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//
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// Run: ./zig-out/bin/sx run examples/237-cleanup-body-restrictions.sx
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#import "modules/std.sx";
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E :: error { Bad }
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g :: () -> !E { return; }
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f :: () -> !E {
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defer { return; } // ERROR: return in defer body
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onfail { try g(); } // ERROR: try in onfail body
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defer { for 0..1 (i) { break; } } // ERROR: break in defer body (transitive through loop)
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onfail (e) { if e == error.Bad { continue; } } // ERROR: continue in onfail body
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try g();
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return;
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}
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main :: () -> s32 { return 0; }
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