Subprogram

        pub const Subprogram = struct {
            pub const ops = [_]AbbrevOp{
                .{ .literal = @backingInt(ModuleBlock.MetadataBlock.Code.SUBPROGRAM) },
                .{ .literal = 0b111 }, // is distinct | has sp flags | has flags
                MetadataAbbrev, // scope
                MetadataAbbrev, // name
                MetadataAbbrev, // linkage name
                MetadataAbbrev, // file
                LineAbbrev, // line
                MetadataAbbrev, // type
                LineAbbrev, // scope line
                .{ .literal = 0 }, // containing type
                .{ .fixed = 32 }, // sp flags
                .{ .literal = 0 }, // virtual index
                .{ .fixed = 32 }, // flags
                MetadataAbbrev, // compile unit
                .{ .literal = 0 }, // template params
                .{ .literal = 0 }, // declaration
                .{ .literal = 0 }, // retained nodes
                .{ .literal = 0 }, // this adjustment
                .{ .literal = 0 }, // thrown types
                .{ .literal = 0 }, // annotations
                .{ .literal = 0 }, // target function name
            };

            scope: Builder.Metadata.Optional,
            name: Builder.Metadata.String.Optional,
            linkage_name: Builder.Metadata.String.Optional,
            file: Builder.Metadata.Optional,
            line: u32,
            ty: Builder.Metadata.Optional,
            scope_line: u32,
            sp_flags: Builder.Metadata.Subprogram.DISPFlags,
            flags: Builder.Metadata.DIFlags,
            compile_unit: Builder.Metadata.Optional,
        }