54e404bca1
`examples/178-any-to-string-optional.sx` prints a struct whose three fields are `?s64` / `?string` / `?bool`, in both Some and None form. The struct-print path goes through `field_value(s, i) -> Any` and then `any_to_string(Any)`. Today: `any_to_string` has no `case optional:` arm and `resolveTypeCategoryTags` has no "optional" category — every optional field falls through to the `<?>` default. Expected output captures the working post-fix form (`a: 42`, `b: hi`, `c: true` for Some; `null` across the board for None). The next commit adds `optional_to_string` + `case optional:` to std and "optional" to `resolveTypeCategoryTags`. Variadic auto-unwrap (`packVariadicCallArgs`) keeps printing direct `print(opt)` calls correctly today; this fix closes the gap for struct fields, slice elements, and anywhere else an optional flows through Any.
32 lines
1.1 KiB
Plaintext
32 lines
1.1 KiB
Plaintext
// any_to_string didn't handle optionals. A struct field of type `?T`
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// printed as `<?>` (any_to_string's "no case matched" default)
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// because there was no `case optional:` arm, and no dispatch table
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// entry mapping `?T` TypeIds to the optional category.
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//
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// The variadic auto-unwrap path (packVariadicCallArgs) papered over
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// this for direct `print("{}\n", opt)` calls — it stringified
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// optionals to either the inner value's repr or `"null"` BEFORE
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// boxing as Any. But anywhere else that boxes an optional and reads
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// it back through any_to_string (struct field printing,
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// `xx opt : Any`, future user code) hit the `<?>` floor.
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//
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// Locks in the fix: each ?T variant routes through `case optional:`
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// → `optional_to_string(cast(type) val)` → either the inner value's
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// `any_to_string` representation or the literal `"null"`.
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#import "modules/std.sx";
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S :: struct {
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a: ?s64;
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b: ?string;
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c: ?bool;
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}
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main :: () {
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s1 := S.{ a = 42, b = "hi", c = true };
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print("{}\n", s1);
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s2 := S.{ a = null, b = null, c = null };
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print("{}\n", s2);
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0;
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}
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