gqlgen: Following the getting started fails with go1.18beta2

What happened?

Trying to follow the getting started fails at step go run github.com/99designs/gqlgen init.

Adding the --verbose flag produces the following error message:

internal error: package "github.com/vektah/gqlparser/v2/ast" without types was imported from "github.com/99designs/gqlgen/graphql/introspection"

Further executions of the generate command produce the same error.

What did you expect?

Being able to go through the getting started without errors.

Minimal graphql.schema and models to reproduce

N/A

versions

• gqlgen v0.16.0
• go v1.18beta2
• go modules

Complete logs (reproduced in a docker container)

$ docker container run -it --rm golang:1.18-rc bash
root@bf9534c22485:/go# mkdir example
root@bf9534c22485:/go# cd example
root@bf9534c22485:/go# go mod init example
go: creating new go.mod: module example
root@bf9534c22485:/go/example# printf '// +build tools\npackage tools\nimport _ "github.com/99designs/gqlgen"' | gofmt > tools.go
root@bf9534c22485:/go# go mod tidy
go: finding module for package github.com/99designs/gqlgen
go: downloading github.com/99designs/gqlgen v0.16.0
go: found github.com/99designs/gqlgen in github.com/99designs/gqlgen v0.16.0
go: downloading github.com/matryer/moq v0.2.3
go: downloading github.com/urfave/cli/v2 v2.3.0
go: downloading github.com/vektah/gqlparser/v2 v2.2.0
go: downloading github.com/stretchr/testify v1.4.0
go: downloading github.com/gorilla/websocket v1.4.2
go: downloading golang.org/x/tools v0.1.5
go: downloading gopkg.in/yaml.v2 v2.2.4
go: downloading github.com/hashicorp/golang-lru v0.5.0
go: downloading github.com/mitchellh/mapstructure v1.2.3
go: downloading github.com/andreyvit/diff v0.0.0-20170406064948-c7f18ee00883
go: downloading github.com/agnivade/levenshtein v1.1.0
go: downloading gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15
go: downloading github.com/davecgh/go-spew v1.1.1
go: downloading github.com/pmezard/go-difflib v1.0.0
go: downloading github.com/sergi/go-diff v1.1.0
go: downloading github.com/kr/pretty v0.1.0
go: downloading github.com/kr/text v0.1.0
go: downloading github.com/cpuguy83/go-md2man/v2 v2.0.1
go: downloading github.com/dgryski/trifles v0.0.0-20200323201526-dd97f9abfb48
go: downloading github.com/arbovm/levenshtein v0.0.0-20160628152529-48b4e1c0c4d0
go: downloading github.com/russross/blackfriday/v2 v2.1.0
go: downloading golang.org/x/mod v0.4.2
go: downloading golang.org/x/sys v0.0.0-20210510120138-977fb7262007
go: downloading golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1
root@bf9534c22485:/go/example# go run github.com/99designs/gqlgen --verbose init
Creating gqlgen.yml
Creating graph/schema.graphqls
Creating server.go
Generating...
internal error: package "github.com/vektah/gqlparser/v2/ast" without types was imported from "github.com/99designs/gqlgen/graphql/introspection"
exit status 1
root@bf9534c22485:/go/example# go run github.com/99designs/gqlgen --verbose generate
internal error: package "github.com/vektah/gqlparser/v2/ast" without types was imported from "github.com/99designs/gqlgen/graphql/introspection"
exit status 1