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.
37 lines
1.1 KiB
Plaintext
37 lines
1.1 KiB
Plaintext
// `!` on an error binding is the truthiness complement of `if e` (issue
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// 0129). Pre-fix, `!` lowered as a bitwise not, so a nonzero error tag
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// stayed nonzero and `if !e` held even on a SET error — with the success
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// value read as garbage. Integer operands get the same `!x ≡ x == 0`
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// semantics.
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#import "modules/std.sx";
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E :: error { Boom }
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f :: (fail: bool) -> i64 !E {
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if fail { raise error.Boom; }
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return 42;
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}
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main :: () -> i32 {
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// set error: `if e` holds, `if !e` must NOT
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v, e := f(true);
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took_e := false;
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if e { took_e = true; }
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if !e { print("BUG: !e held on a set error (v={})\n", v); return 1; }
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if !took_e { print("BUG: if e did not hold on a set error\n"); return 2; }
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// success: `if !e` holds and the value is real
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v2, e2 := f(false);
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if e2 { print("BUG: e2 set on success\n"); return 3; }
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if !e2 { print("ok: !e2 on success, v2={}\n", v2); }
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// integers: `!n` is `n == 0`, not a bit flip
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n := 7;
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if !n { print("BUG: !7 held\n"); return 4; }
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z := 0;
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if !z { print("ok: !0 holds\n"); }
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print("done\n");
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return 0;
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}
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