MetadataBlock

        pub const MetadataBlock = struct {
            pub const id: BlockId = .METADATA;

            pub const abbrevs = [_]type{
                ModuleBlock.FunctionBlock.MetadataBlock.Value,
            };

            pub const Value = struct {
                pub const ops = [_]AbbrevOp{
                    .{ .literal = @backingInt(ModuleBlock.MetadataBlock.Code.VALUE) },
                    .{ .fixed = 32 }, // variable
                    .{ .fixed = 32 }, // expression
                };

                ty: Builder.Type,
                value: Builder.Value,
            };
        }