structTypeAssumeCapacity

fn structTypeAssumeCapacity(
    self: *Builder,
    comptime kind: Type.Structure.Kind,
    fields: []const Type,
) Type {
    const tag: Type.Tag = switch (kind) {
        .normal => .structure,
        .@"packed" => .packed_structure,
    };
    const Adapter = struct {
        builder: *const Builder,
        pub fn hash(_: @This(), key: []const Type) u32 {
            return @truncate(std.hash.Wyhash.hash(
                comptime std.hash.int(@backingInt(tag)),
                std.mem.sliceAsBytes(key),
            ));
        }
        pub fn eql(ctx: @This(), lhs_key: []const Type, _: void, rhs_index: usize) bool {
            const rhs_data = ctx.builder.type_items.items[rhs_index];
            if (rhs_data.tag != tag) return false;
            var rhs_extra = ctx.builder.typeExtraDataTrail(Type.Structure, rhs_data.data);
            const rhs_fields = rhs_extra.trail.next(rhs_extra.data.fields_len, Type, ctx.builder);
            return std.mem.eql(Type, lhs_key, rhs_fields);
        }
    };
    const gop = self.type_map.getOrPutAssumeCapacityAdapted(fields, Adapter{ .builder = self });
    if (!gop.found_existing) {
        gop.key_ptr.* = {};
        gop.value_ptr.* = {};
        self.type_items.appendAssumeCapacity(.{
            .tag = tag,
            .data = self.addTypeExtraAssumeCapacity(Type.Structure{
                .fields_len = @intCast(fields.len),
            }),
        });
        self.type_extra.appendSliceAssumeCapacity(@ptrCast(fields));
    }
    return @fromBackingInt(@intCast(gop.index));
}