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).
37 lines
1.3 KiB
Plaintext
37 lines
1.3 KiB
Plaintext
// Error return-trace formatting (ERR step E3.3). `library/modules/trace.sx`
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// reads the trace buffer (E3.1, populated by E3.2's raise/try push wiring) and
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// renders it. `trace.print_current()` writes the trace to stderr; the catch
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// handler sees the full chain because the absorption clear fires at handler
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// EXIT, not entry. Frame locations are placeholders until DWARF (ERR E3.0)
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// resolves PCs to file:line; the count + ordering are already meaningful.
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//
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// Note: the trace goes to stderr. The test runner merges stderr+stdout, so the
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// snapshot shows the trace lines interleaved with the `print` (stdout) lines.
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#import "modules/std.sx";
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trace :: #import "modules/trace.sx";
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// Buffer length probe (the runtime symbol; public read API is the trace module).
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sx_trace_len :: () -> u32 #foreign;
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E :: error { BadInput, Overflow }
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leaf :: (n: s32) -> !E {
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if n < 0 { raise error.BadInput; } // pushes frame 0
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return;
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}
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mid :: (n: s32) -> !E {
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try leaf(n); // propagation pushes frame 1
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return;
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}
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main :: () -> s32 {
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mid(-1) catch (e) {
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print("[stdout] caught {}\n", e); // tag name via the always-linked table
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trace.print_current(); // [stderr] the 2-frame trace
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};
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print("[stdout] recovered; trace buffer now empty (len {})\n", sx_trace_len());
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return 0;
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}
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