parseExprInner

    fn parseExprInner(
        self: *@This(),
        T: type,
        node: Zoir.Node.Index,
    ) ParseExprInnerError!T {
        if (T == Zoir.Node.Index) {
            return node;
        }

        switch (@typeInfo(T)) {
            .optional => |optional| if (node.get(self.zoir) == .null) {
                return null;
            } else {
                return try self.parseExprInner(optional.child, node);
            },
            .bool => return self.parseBool(node),
            .int => return self.parseInt(T, node),
            .float => return self.parseFloat(T, node),
            .@"enum" => return self.parseEnumLiteral(T, node),
            .pointer => |pointer| switch (pointer.size) {
                .one => {
                    const result = try self.gpa.create(pointer.child);
                    errdefer self.gpa.destroy(result);
                    result.* = try self.parseExprInner(pointer.child, node);
                    return result;
                },
                .slice => return self.parseSlicePointer(T, node),
                else => comptime unreachable,
            },
            .array => return self.parseArray(T, node),
            .vector => |vector| {
                const A = [vector.len]vector.child;
                return try self.parseArray(A, node);
            },
            .@"struct" => |@"struct"| if (@"struct".is_tuple)
                return self.parseTuple(T, node)
            else
                return self.parseStruct(T, node),
            .@"union" => return self.parseUnion(T, node),

            else => comptime unreachable,
        }
    }