21626628cd
Step 4A final-slice's smoke test. Exercises the FULL surface
step 5's generic Into(Block) impl needs to operate:
1. A pack-fn binds $args (whole pack as []Type).
2. The body walks `list := $args` at INTERP time.
3. Per position, calls `type_name(list[i])` — the dynamic
form that emits `callBuiltin(.type_name, ...)` at lower
time, dispatched at interp time to read the runtime
Value.type_tag and return the concrete type name.
`examples/172-pack-builder-smoke.sx` exercises four call
shapes via #run:
describe() → []
describe(42) → [s64]
describe(42, "hi") → [s64, string]
describe(true, 3.14, "x", 99) → [bool, f64, string, s64]
Each call shape builds its own [N x Any] slice of .type_tag
values at lowering time, the interp walks the slice, and the
per-element type names come out kind-honestly.
212/212 example tests + zig build test green.
49 lines
1.7 KiB
Plaintext
49 lines
1.7 KiB
Plaintext
// Variadic heterogeneous type packs — step 4A end-to-end
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// smoke. Exercises the FULL chain step 5's generic
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// `Into(Block)` impl needs:
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//
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// 1. A pack-fn that passes its bound `$args` to a builder
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// via `#run` / `#insert` (here `#run` for simplicity).
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// 2. The builder receives a `[]Type` slice and walks it,
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// calling `type_name(list[i])` per position.
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// 3. `type_name(list[i])` is the DYNAMIC form — the index_expr
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// argument can't be statically resolved at lower time, so
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// the lowering emits a `callBuiltin(.type_name, ...)` that
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// the interp's arm handles by reading the runtime
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// `Value.type_tag(TypeId)` and returning the per-position
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// name.
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//
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// The smoke demonstrates that step 4's full surface — bare
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// `$args` (whole pack as []Type) + dynamic reflection
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// intrinsics + per-position type discovery at interp time —
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// hangs together end-to-end. This is the foundation step 5's
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// builder-driven generic Into(Block) impl rests on.
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#import "modules/std.sx";
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#import "modules/compiler.sx";
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// Generic "describe pack" builder. Receives the pack as
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// []Type, returns a joined string with each type's name.
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describe :: (..$args) -> string {
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list := $args;
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s := "[";
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i : s64 = 0;
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while i < list.len {
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if i > 0 { s = concat(s, ", "); }
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s = concat(s, type_name(list[i]));
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i = i + 1;
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}
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s = concat(s, "]");
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return s;
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}
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run_all :: () {
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print("{}\n", describe()); // []
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print("{}\n", describe(42)); // [s64]
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print("{}\n", describe(42, "hi")); // [s64, string]
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print("{}\n", describe(true, 3.14, "x", 99)); // [bool, f64, string, s64]
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}
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#run run_all();
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main :: () { print("rt\n"); }
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