Error message when using a keyword in ref should suggest `["keyword"]` syntax

[anderseknert]

package p

r {
    input.default
}

opa eval -d p.rego -f pretty data.p.r
1 error occurred: p.rego:4: rego_parse_error: unexpected default keyword: expected ident
	input.default

This error message is difficult to understand, and does not provide a solution. If possible, we should suggest rewriting the ref to be input["default"]. Finally, let's try and avoid internal lingo like "ident" in these type of messages.

[srenatus]

I'm agreeing with most points, but wouldn't it be great if the above was just valid? ✨ There's no ambiguity here. Same with input.default, input.with.foo, input.import.foobar, input.package... the list is long.

[anderseknert]

That would be awesome! 🤩

[stale]

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