Subpar trees for unclosed blocks

[dominikh]

For the following snippet

package pkg

func foo() {
// bar

the grammar produces an ERROR (not a MISSING "}"), and places the commentnode outside thefunction_declaration`:

source_file [0, 0] - [5, 0]
  package_clause [0, 0] - [0, 11]
    package [0, 0] - [0, 7]
    package_identifier [0, 8] - [0, 11]
  
 [0, 11] - [2, 0]
  function_declaration [2, 0] - [2, 10]
    func [2, 0] - [2, 4]
    name: identifier [2, 5] - [2, 8]
    parameters: parameter_list [2, 8] - [2, 10]
      ( [2, 8] - [2, 9]
      ) [2, 9] - [2, 10]
  ERROR [2, 11] - [2, 12]
    { [2, 11] - [2, 12]
  comment [3, 0] - [3, 6]

(In fact we get ERROR instead of MISSING for a completely empty body, too.)

If there's some other node in the body (either in addition to or instead of the comment), we get a more useful tree. For

package pkg

func foo() {
bar()

we get

source_file [0, 0] - [5, 0]
  package_clause [0, 0] - [0, 11]
    package [0, 0] - [0, 7]
    package_identifier [0, 8] - [0, 11]
  
 [0, 11] - [2, 0]
  function_declaration [2, 0] - [5, 0]
    func [2, 0] - [2, 4]
    name: identifier [2, 5] - [2, 8]
    parameters: parameter_list [2, 8] - [2, 10]
      ( [2, 8] - [2, 9]
      ) [2, 9] - [2, 10]
    body: block [2, 11] - [5, 0]
      { [2, 11] - [2, 12]
      expression_statement [3, 0] - [3, 5]
        call_expression [3, 0] - [3, 5]
          function: identifier [3, 0] - [3, 3]
          arguments: argument_list [3, 3] - [3, 5]
            ( [3, 3] - [3, 4]
            ) [3, 4] - [3, 5]
      
 [3, 5] - [5, 0]
      MISSING "}" [5, 0] - [5, 0]