failExpectedTypeInner

    fn failExpectedTypeInner(
        self: @This(),
        T: type,
        opt: bool,
        node: Zoir.Node.Index,
    ) error{ ParseZon, OutOfMemory } {
        _ = valid_types;
        switch (@typeInfo(T)) {
            .@"struct" => |@"struct"| if (@"struct".is_tuple) {
                if (opt) {
                    return self.failNode(node, "expected optional tuple");
                } else {
                    return self.failNode(node, "expected tuple");
                }
            } else {
                if (opt) {
                    return self.failNode(node, "expected optional struct");
                } else {
                    return self.failNode(node, "expected struct");
                }
            },
            .@"union" => if (opt) {
                return self.failNode(node, "expected optional union");
            } else {
                return self.failNode(node, "expected union");
            },
            .array => if (opt) {
                return self.failNode(node, "expected optional array");
            } else {
                return self.failNode(node, "expected array");
            },
            .pointer => |pointer| switch (pointer.size) {
                .one => return self.failExpectedTypeInner(pointer.child, opt, node),
                .slice => {
                    if (pointer.child == u8 and
                        pointer.attrs.@"const" and
                        (pointer.sentinel() == null or pointer.sentinel() == 0) and
                        (pointer.attrs.@"align" == null or pointer.attrs.@"align" == 1))
                    {
                        if (opt) {
                            return self.failNode(node, "expected optional string");
                        } else {
                            return self.failNode(node, "expected string");
                        }
                    } else {
                        if (opt) {
                            return self.failNode(node, "expected optional array");
                        } else {
                            return self.failNode(node, "expected array");
                        }
                    }
                },
                else => comptime unreachable,
            },
            .vector, .bool, .int, .float => if (opt) {
                return self.failNodeFmt(node, "expected type '{s}'", .{@typeName(?T)});
            } else {
                return self.failNodeFmt(node, "expected type '{s}'", .{@typeName(T)});
            },
            .@"enum" => if (opt) {
                return self.failNode(node, "expected optional enum literal");
            } else {
                return self.failNode(node, "expected enum literal");
            },
            .optional => |optional| {
                return self.failExpectedTypeInner(optional.child, true, node);
            },
            else => comptime unreachable,
        }
    }