cd /tmp
cat > foo.toml <<EOF
api = "0.4"

[buildpack]
id = "heroku/java-function"
version = "0.3.21"
name = "Java Function"
homepage = "https://github.com/heroku/buildpacks-jvm"
keywords = ["java", "function"]

[[licenses]]
type = "MIT"

[[order]]

[[order.group]]
id = "heroku/jvm"
version = "0.1.8"

[[order.group]]
id = "heroku/maven"
version = "0.2.5"

[[order.group]]
id = "heroku/jvm-function-invoker"
version = "0.5.3"

[metadata]

[metadata.release]

[metadata.release.docker]
repository = "public.ecr.aws/heroku-buildpacks/heroku-java-function-buildpack"
EOF

gem install toml
ruby -rtoml -e "TOML.load(File.read('foo.toml'))"

/Users/rschneeman/.gem/ruby/3.0.2/gems/toml-0.3.0/lib/toml/parser.rb:57:in `resolve_table_array': undefined method `has_key?' for nil:NilClass (NoMethodError)
	from /Users/rschneeman/.gem/ruby/3.0.2/gems/toml-0.3.0/lib/toml/parser.rb:37:in `block in initialize'
	from /Users/rschneeman/.gem/ruby/3.0.2/gems/toml-0.3.0/lib/toml/parser.rb:16:in `each'
	from /Users/rschneeman/.gem/ruby/3.0.2/gems/toml-0.3.0/lib/toml/parser.rb:16:in `initialize'
	from /Users/rschneeman/.gem/ruby/3.0.2/gems/toml-0.3.0/lib/toml.rb:19:in `new'
	from /Users/rschneeman/.gem/ruby/3.0.2/gems/toml-0.3.0/lib/toml.rb:19:in `load'
	from -e:1:in `<main>'