66bdc70bf1
Move examples/*.sx and their expected/ snapshots into per-category subfolders (examples/<category>/...). Folder = leading filename token, with ffi-objc/ffi-jni kept whole; filenames are unchanged. The corpus runner and LSP sweep now discover each category's expected/ dir, while issues/ stays flat. Example 1058's repo-root-relative companion import is made file-relative. Path strings embedded in 164 snapshots were regenerated (path-only changes). Test-layout docs in CLAUDE.md updated.
37 lines
1.7 KiB
Plaintext
37 lines
1.7 KiB
Plaintext
// A comptime-constructed type with NO members is VALID for every kind:
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// - an empty struct `struct {}` and empty tuple `()` are zero-size aggregates
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// you can instantiate (`.{}`),
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// - an empty enum and an empty tagged_union are valid uninhabited / zero-member
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// types — legitimate to NAME and reference even though they have no
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// constructible value (no variant to construct).
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//
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// This mirrors normal sx, where `struct {}` and `enum {}` already codegen fine;
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// the metatype `define`/`declare` path now agrees (the old blanket
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// "a type with no members is never valid" rejection is gone).
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//
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// The ONLY thing still rejected on this path is a bare `declare("X")` that is
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// never completed by a matching `define` — an INCOMPLETE forward slot that would
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// panic codegen. That case is exercised by examples/1179.
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#import "modules/std.sx";
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#import "modules/std/meta.sx";
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// Explicitly-defined empty types of every kind.
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EmptyStruct :: define(declare("EmptyStruct"), .struct(.{ fields = .[] }));
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EmptyTuple :: define(declare("EmptyTuple"), .tuple(.{ elements = .[] }));
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EmptyEnum :: define(declare("EmptyEnum"), .enum(.{ variants = .[] }));
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// An empty tagged_union (kind 3): no variants, but a valid named type. (The
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// `define` DSL maps an all-void variant set to a payloadless enum, so reach for
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// the register_type primitive directly to mint a 0-variant tagged_union.)
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EmptyUnion :: register_type(declare("EmptyUnion"), 3, .[]);
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main :: () -> i32 {
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// Instantiate the constructible ones.
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s : EmptyStruct = .{};
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t : EmptyTuple = .{};
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_ = s;
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_ = t;
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// EmptyEnum / EmptyUnion are uninhabited — valid as types, no value to make.
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print("empty struct/tuple/enum/tagged_union are all valid\n");
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return 0;
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}
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