989e18b760
Replace the bare-paren tuple grammar with explicit, position-unambiguous
forms, mirroring how structs work:
type `(A, B)` -> `Tuple(A, B)` (named keeps `:`)
value `(a, b)` -> `.(a, b)` (named uses `=`)
typed (new) -> `Tuple(A, B).(a, b)` (like `Point.{...}`)
failable `-> (T, !)` -> `-> T !`
`-> (T1, T2, !)`-> `-> Tuple(T1, T2) !` (channel outside Tuple)
Bare `(...)` is now grouping only, everywhere; a comma in bare parens is a
hard error with a migration hint. Grouping, function types `(A, B) -> R`,
param lists, lambdas, and match bindings are unaffected.
`Tuple(...)` is strictly a TYPE in every position (including `size_of` /
`type_info` args); a tuple VALUE comes only from `.(...)` (anonymous) or
`Tuple(...).(...)` (explicitly typed). A bare `Tuple(1, 2)` is a tuple
type with non-type elements -> rejected.
The ~110 tuple-bearing corpus files were migrated with a one-shot
AST-aware migrator (the `sx migrate` tool from the prior commit, removed
here). New examples: 0130 (new syntax), 0131 (typed construction), 1060
(named-tuple failable return). 1116 golden updated for the new hint text.
30 lines
1.2 KiB
Plaintext
30 lines
1.2 KiB
Plaintext
// Failable `-> !` main entry-point wrapper (ERR step E4.2). A pure-failable
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// main that lets an error reach the function boundary exits 1 and prints the
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// unhandled-error header (with the tag name, via the always-linked tag-name
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// table) plus the return trace to stderr — instead of the old behavior of
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// returning the raw tag id as the exit code with no diagnostic. A successful
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// run (no escaping error) exits 0.
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//
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// Note: the header + trace go to stderr. The test runner merges stderr+stdout,
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// so the snapshot shows them interleaved with the `print` (stdout) lines.
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// Frame locations are placeholders until DWARF (ERR E3.0); count + ordering +
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// the tag name are already meaningful. Expected exit code: 1.
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#import "modules/std.sx";
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ParseErr :: error { Empty, BadDigit };
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inner :: (n: i32) -> i32 !ParseErr {
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if n == 0 { raise error.Empty; } // pushes a frame
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if n < 0 { raise error.BadDigit; }
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return n * 2;
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}
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main :: () -> !ParseErr {
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v := try inner(5); // succeeds → v = 10
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print("v = {}\n", v);
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w := try inner(0); // raises Empty → propagates to main
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print("w = {}\n", w); // never reached
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return;
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}
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