agra 1c26944eda feat: make_variant — construct a minted tagged-union value by index (stdlib) ...

The metatype system can MINT tagged-union types (`make_enum`) and READ them
(`field_count`/`field_name`/`field_type`/`field_value`); `make_variant` is the
missing WRITE side — build a value of a minted tagged-union `E` whose active
variant is `idx`, carrying `payload`. Needed when the variant is selected at
RUNTIME but the union was synthesized at comptime so its labels can't be spelled
as a literal `.label(payload)` — e.g. the `race` result: an `inline for 0..N (i)`
arm constructs the i-th variant of a synthesized result with the winner's value.

Pure sx in modules/std/meta.sx (NOT a compiler builtin): a minted tagged-union is
laid out `{ i64 tag @0, payload @ size_of(i64) }` (the compiler fixes `tag_type`
to i64 for minted enums), so make_variant zeroes the value then writes the tag and
payload at those offsets — the same offsets the compiler's own enum_init/payload
ops use. The header comment documents the minted-only / i64-tag layout coupling.

Adversarially reviewed (SHIP): the offset-8 payload assumption is exactly the
compiler's enum layout with no alignment hazard (the payload is an alignment-1
`[N x i8]` array immediately after the i64 header); complex payloads (multi-field
struct, string fat pointer, 40-byte struct) round-trip. Locked by
examples/comptime/0650-comptime-make-variant.sx (heterogeneous + complex payloads,
runtime-index selection via the comptime `case` form). Suite green (822/0).

2026-06-26 15:32:47 +03:00

..

0600-comptime-run.exit

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0600-comptime-run.stderr

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0600-comptime-run.stdout

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0601-comptime-meta.exit

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0601-comptime-meta.stderr

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0601-comptime-meta.stdout

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0602-comptime-interp-cast-ptr-cmp.exit

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0602-comptime-interp-cast-ptr-cmp.stdout

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0603-comptime-interp-variadic-any.exit

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0603-comptime-interp-variadic-any.stderr

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0603-comptime-interp-variadic-any.stdout

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0604-comptime-typed-store-widths.exit

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0604-comptime-typed-store-widths.stdout

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0605-comptime-aggregate-global.exit

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0605-comptime-aggregate-global.stderr

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0605-comptime-aggregate-global.stdout

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0606-comptime-string-global.exit

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0606-comptime-string-global.stderr

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0606-comptime-string-global.stdout

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0607-comptime-nested-comptime-return.exit

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0607-comptime-nested-comptime-return.stderr

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0607-comptime-nested-comptime-return.stdout

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0608-comptime-comptime.exit

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0608-comptime-comptime.stderr

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0608-comptime-comptime.stdout

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0609-comptime-inline-if.exit

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0609-comptime-inline-if.stderr

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0609-comptime-inline-if.stdout

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0610-comptime-inline-for-const-bound.exit

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0610-comptime-inline-for-const-bound.stderr

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0610-comptime-inline-for-const-bound.stdout

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0611-comptime-integral-float-inline-for.exit

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0611-comptime-integral-float-inline-for.stderr

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0611-comptime-integral-float-inline-for.stdout

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0612-comptime-inline-for-range-bounds.exit

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0612-comptime-inline-for-range-bounds.stderr

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0613-comptime-print-any-type.exit

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0613-comptime-print-any-type.stderr

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0613-comptime-print-any-type.stdout

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0614-comptime-metatype-enum.exit

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0614-comptime-metatype-enum.stderr

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0614-comptime-metatype-enum.stdout

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0615-comptime-metatype-typefn-identity.exit

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0615-comptime-metatype-typefn-identity.stderr

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0615-comptime-metatype-typefn-identity.stdout

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0616-comptime-field-type.exit

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0616-comptime-field-type.stderr

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0616-comptime-field-type.stdout

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0617-comptime-metatype-channel-results.exit

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0617-comptime-metatype-channel-results.stderr

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0617-comptime-metatype-channel-results.stdout

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0618-comptime-metatype-self-reference.exit

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0618-comptime-metatype-self-reference.stderr

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0618-comptime-metatype-self-reference.stdout

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0619-comptime-metatype-type-info.exit

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0619-comptime-metatype-type-info.stderr

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0619-comptime-metatype-type-info.stdout

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0620-comptime-metatype-make-enum.exit

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0620-comptime-metatype-make-enum.stderr

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0620-comptime-metatype-make-enum.stdout

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0621-comptime-metatype-make-enum-sliced.exit

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0621-comptime-metatype-make-enum-sliced.stderr

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0621-comptime-metatype-make-enum-sliced.stdout

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0622-comptime-metatype-struct.exit

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0622-comptime-metatype-struct.stderr

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0622-comptime-metatype-struct.stdout

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0623-comptime-metatype-tuple.exit

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0623-comptime-metatype-tuple.stderr

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0623-comptime-metatype-tuple.stdout

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0624-comptime-metatype-generic-typefn-local.exit

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0624-comptime-metatype-generic-typefn-local.stderr

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0624-comptime-metatype-generic-typefn-local.stdout

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0626-comptime-weld-fn-intern-text-of.exit

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0626-comptime-weld-fn-intern-text-of.stdout

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0627-comptime-enum-value-param.exit

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0627-comptime-enum-value-param.stderr

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0627-comptime-enum-value-param.stdout

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0628-comptime-compiler-find-type.exit

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0628-comptime-compiler-find-type.stdout

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0629-comptime-compiler-field-reflect.exit

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0629-comptime-compiler-field-reflect.stderr

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0629-comptime-compiler-field-reflect.stdout

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0630-comptime-compiler-type-kind.exit

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0630-comptime-compiler-type-kind.stderr

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0630-comptime-compiler-type-kind.stdout

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0631-comptime-compiler-register-graph.exit

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0631-comptime-compiler-register-graph.stdout

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0632-comptime-metatype-make-enum-payloadless.exit

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0633-comptime-compiler-namespaced-type.exit

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0633-comptime-compiler-namespaced-type.stderr

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0634-comptime-compiler-bare-import-type.exit

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0634-comptime-compiler-bare-import-type.stdout

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0635-comptime-compiler-multi-edge-import.exit

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0635-comptime-compiler-multi-edge-import.stderr

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0636-comptime-extern-libc.exit

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0637-comptime-extern-slice-arg.exit

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0637-comptime-extern-slice-arg.stderr

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0638-comptime-domain-fn-not-emitted.exit

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0639-comptime-bitwise-shift.exit

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0640-comptime-list-grown-variant-define.exit

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0640-comptime-tagged-union-value-param.exit

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0641-comptime-empty-types-valid.exit

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0642-comptime-value-param-generic-method.exit

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0643-comptime-run-optional-aggregate.exit

fix: comptime VM reg→value bridge for optional results (issue 0162)

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0643-comptime-run-optional-aggregate.stderr

fix: comptime VM reg→value bridge for optional results (issue 0162)

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0643-comptime-run-optional-aggregate.stdout

fix: comptime VM reg→value bridge for optional results (issue 0162)

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0644-comptime-run-array-aggregate.exit

fix: comptime reg->value bridge for array-in-aggregate + clean abort on comptime-init failure (issue 0167)

2026-06-23 11:34:22 +03:00

0644-comptime-run-array-aggregate.stderr

fix: comptime reg->value bridge for array-in-aggregate + clean abort on comptime-init failure (issue 0167)

2026-06-23 11:34:22 +03:00

0644-comptime-run-array-aggregate.stdout

fix: comptime reg->value bridge for array-in-aggregate + clean abort on comptime-init failure (issue 0167)

2026-06-23 11:34:22 +03:00

0645-comptime-body-local-run-bridgeable.exit

fix: body-local #run of an unbridged shape fails loudly instead of silent garbage (issue 0182)

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0645-comptime-body-local-run-bridgeable.stderr

fix: body-local #run of an unbridged shape fails loudly instead of silent garbage (issue 0182)

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0645-comptime-body-local-run-bridgeable.stdout

fix: body-local #run of an unbridged shape fails loudly instead of silent garbage (issue 0182)

2026-06-23 19:29:11 +03:00

0646-comptime-field-reflect-tuple-array.exit

fix: comptime field reflection on tuples/arrays/vectors (issue 0195)

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0646-comptime-field-reflect-tuple-array.stderr

fix: comptime field reflection on tuples/arrays/vectors (issue 0195)

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fix: comptime field reflection on tuples/arrays/vectors (issue 0195)

2026-06-26 12:28:09 +03:00

0647-comptime-pointee-reflection.exit

feat: pointee($P: Type) -> Type comptime reflection builtin

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0647-comptime-pointee-reflection.stderr

feat: pointee($P: Type) -> Type comptime reflection builtin

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0647-comptime-pointee-reflection.stdout

feat: pointee($P: Type) -> Type comptime reflection builtin

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0648-comptime-typequery-const-fold.exit

feat: fold field_count/size_of/align_of as comptime constants

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0648-comptime-typequery-const-fold.stderr

feat: fold field_count/size_of/align_of as comptime constants

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0648-comptime-typequery-const-fold.stdout

feat: fold field_count/size_of/align_of as comptime constants

2026-06-26 13:13:16 +03:00

0649-comptime-typecall-composition.exit

feat: comptime type-call composition (field_type/pointee/field_name in value position)

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0649-comptime-typecall-composition.stderr

feat: comptime type-call composition (field_type/pointee/field_name in value position)

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0649-comptime-typecall-composition.stdout

feat: comptime type-call composition (field_type/pointee/field_name in value position)

2026-06-26 13:40:52 +03:00

0650-comptime-make-variant.exit

feat: make_variant — construct a minted tagged-union value by index (stdlib)

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0650-comptime-make-variant.stderr

feat: make_variant — construct a minted tagged-union value by index (stdlib)

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0650-comptime-make-variant.stdout

feat: make_variant — construct a minted tagged-union value by index (stdlib)

2026-06-26 15:32:47 +03:00

0651-comptime-inline-if-return.exit

fix: return inside inline if no longer drops trailing statements

2026-06-26 15:32:32 +03:00

0651-comptime-inline-if-return.stderr

fix: return inside inline if no longer drops trailing statements

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0651-comptime-inline-if-return.stdout

fix: return inside inline if no longer drops trailing statements

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