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).
26 lines
1.1 KiB
Plaintext
26 lines
1.1 KiB
Plaintext
// Program-wide closure-shape union — widening REJECTION (ERR E5.1 sub-feature 2).
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// Two closure literals of shape `Closure(s32)->(s32,!)` raise `Negative` /
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// `Other`; the shared inferred-`!` node for that shape is { Negative, Other }.
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// A caller that `try`s a slot of this shape but declares only `!Small` (which
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// omits both tags) is rejected — the union is checked against the caller's set
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// even though the call goes through a slot with no static function name.
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#import "modules/std.sx";
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Small :: error { Unrelated }
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reject :: (h: Closure(s32) -> (s32, !), x: s32) -> (s32, !Small) {
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return try h(x); // Negative, Other ∉ Small → two diagnostics
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}
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main :: () -> s32 {
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gpa := GPA.init();
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push Context.{ allocator = xx gpa } {
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handlers : List(Closure(s32) -> (s32, !)) = .{};
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handlers.append(closure((x: s32) -> (s32, !) { if x < 0 { raise error.Negative; } return x; }));
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handlers.append(closure((x: s32) -> (s32, !) { if x == 0 { raise error.Other; } return x; }));
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print("r={}\n", reject(handlers.items[0], 5) catch (e) 0);
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}
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return 0;
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}
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