Turtle parser does not restore subject context after parsing RDF collections about rdf4h

[robstewart57]

Fixed by fabianmeyer@52b2906

[fabianmeyer]

There also seems to be an issue with blank nodes inside of collections:

@prefix : <http://example.org/foo#> .
:subject
  :predicate1 ( [
    :predicate3 :a
  ] ) ;
  :predicate2 :b .

Adds the :predicate2 :b to the list node:

Triple (UNode "http://example.org/foo#subject") (UNode "http://example.org/foo#predicate1") (BNodeGen 1)
Triple (BNodeGen 1) (UNode "http://example.org/foo#predicate2") (UNode "http://example.org/foo#b")
Triple (BNodeGen 1) (UNode "http://www.w3.org/1999/02/22-rdf-syntax-ns#first") (BNodeGen 2)
Triple (BNodeGen 2) (UNode "http://example.org/foo#predicate3") (BNodeGen 3)
Triple (BNodeGen 2) (UNode "http://www.w3.org/1999/02/22-rdf-syntax-ns#rest") (UNode "http://www.w3.org/1999/02/22-rdf-syntax-ns#nil")
Triple (BNodeGen 3) (UNode "http://www.w3.org/1999/02/22-rdf-syntax-ns#first") (UNode "http://example.org/foo#a")

Unfortunately, I'm not quite sure about the cause and how to fix it. Perhaps a missing popped subject-context somewhere else?

[robstewart57]

OK. I don't have a chance to look at this just now, so I've added it as a failing unit test:

a98cb77

Which can be run with:

stack test --test-arguments="--pattern conformance-turtle-example10"