Unable to use HCL identifiers with "`.`" in function call in block attribute

While investigating the following syntax:

example "something arbitrary" {
   result = repository.file("main.go").example
}

I ran into the following error parsing it:

Error: Missing newline after argument

  on issue.hcl line 2, in example "something arbitrary":
   2:    result = repository.file("main.go").example

An argument definition must end with a newline.

issue.hcl:2,28-29: Missing newline after argument; An argument definition must end with a newline.

Seems related to this line in (*hclsyntax.parser).finishParsingBodyAttribute:

https://github.com/hashicorp/hcl/blob/67270baea3ce5e9c56470c3bfc505ca4e2c2de8c/hclsyntax/parser.go#L260

Based on my reading of the spec's "function call" and "identifier" definitions, this seems like it could be possible, but currently ins't implemented? Or is this something that isn't allowed purposefully? It's not clear to me how traversals should work in this case.

Start in hclsyntax/parser.go at (*hclsyntax.parser).finishParsingBodyAttribute and inspect how function calls, identifiers, and traversals are parsed. Compare that behavior with the function call and identifier rules in the HCL specification, then establish whether the example syntax should parse and capture the expected result in parser coverage.