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
1.2 KiB
Plaintext
28 lines
1.2 KiB
Plaintext
// A closure VALUE (a pre-bound variable) cannot be passed into a bare
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// function-pointer slot `(...) -> ...` (ERR E5.1). The bare ABI calls
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// `fn_ptr(ctx, args)` with no env channel, so a closure's environment can't be
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// carried — passing one is unsound (drops env / shifts args / segfaults on a
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// capturing closure). Only a closure LITERAL crosses this boundary (lowerLambda
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// emits a static adapter); a variable is rejected with a pointer to the idiom.
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//
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// The fix for these is either to pass the literal directly, or to type the
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// parameter `Closure(...)` so the environment is carried (the idiomatic form).
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#import "modules/std.sx";
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E :: error { Z }
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bare :: (cb: (s64) -> s64, n: s64) -> s64 { return cb(n); }
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baref :: (cb: (s64) -> (s64, !E), n: s64) -> s64 { return cb(n) catch (e) -1; }
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main :: () -> s32 {
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inc := closure((x: s64) -> s64 => x + 1); // capture-free closure var
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base := 100;
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add := closure((x: s64) -> s64 => x + base); // CAPTURING closure var
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_ := bare(inc, 9); // reject: closure value → bare slot
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_ := baref(inc, 9); // reject: also the ∅-widening crossing
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_ := bare(add, 9); // reject: capturing closure → bare slot
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return 0;
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}
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