Referencing members in traits fails parsing by Smithy assembler

[b-vennes]

I am attempting to create a new trait which uses the idRef trait. The new trait lets members in structs be linked to members of other structs. When I reference a struct member from the trait using the @traitName(StructName$memberName) syntax I get the following parsing error when loading the model using the Smithy assembler: Expected RPAREN(')') but found DOLLAR('$'). Is this the expected behavior for referencing members within traits, or should it be possible?

This is a minimal example which demonstrates the behavior:

$version: "2.0"

namespace example

@trait
@idRef(failWhenMissing: true, selector: ":test(structure) > member")
string link

structure StructA {
  @required
  id: String
}

structure StructB {
  @required
  @link(StructA$id) // invalid line
  structAId: String
}

This model appears to be valid when parsed by both the Smithy LSP and Intellij Smithy Plugin syntax highlighting.

I also noticed that I can replace @link(StructA$id) with a fully qualified string like @link("example#StructA$Id") and it will parse and assemble correctly.

[mtdowling]

Looks like a bug in the parser.