EnsureNode SourceSection does not cover the full try part, and not the ensure part

[eregon]

Instead it seems to only cover the first line.
Debugged with @nirvdrum, the EnsureNode SourceSection only covers line 8, while the tryPart is a SequenceNode covering lines 8 and 9. The zsuper is at line 9 and can't have a breakpoint, most likely due to this.

[eregon]

NodeUtil.printSourceAttributionTree() is quite useful for this:

def foo
  begin
    body1
    body2
  ensure
    guaranteed1
    guaranteed2
  end
end

Truffle::Debug.print_source_sections(method(:foo))

gives

Full source len=(139)  ___def foo
  begin
    body1
    body2
  ensure
    guaranteed1
    guaranteed2
  end
end

Truffle::Debug.print_source_sections(method(:foo))
___
AST source attribution:
|   (RubyMethodRootNode)  SourceSection(source=ensure_lines.rb [1:1 - 9:3], index=0, length=86, characters=def foo\n  begin\n    body1\n    body2\n  ensure\n    guaranteed1\n    guaranteed2\n  end\nend)source: (0,85) line=1 len=86 text="def foo
  begin
    body1
    body2
  ensure
    guaranteed1
    guaranteed2
  end
end"
| | body  (SequenceNode)  SourceSection(source=ensure_lines.rb [1:1 - 9:3], index=0, length=86, characters=def foo\n  begin\n    body1\n    body2\n  ensure\n    guaranteed1\n    guaranteed2\n  end\nend)source: (0,85) line=1 len=86 text="def foo
  begin
    body1
    body2
  ensure
    guaranteed1
    guaranteed2
  end
end"
| | | body[0]  (WriteLocalVariableNode)  
| | | | valueNode  (ProfileArgumentNodeGen)  
| | | | | child_  (ReadSelfNode)  
| | | body[1]  (SaveMethodBlockNode)  
| | | body[2]  (EnsureNode)  SourceSection(source=ensure_lines.rb [3:1 - 3:9], index=16, length=9, characters=    body1)source: (16,24) line=3 len=9 text="    body1"
| | | | tryPart  (SequenceNode)  SourceSection(source=ensure_lines.rb [3:1 - 4:9], index=16, length=19, characters=    body1\n    body2)source: (16,34) line=3 len=19 text="    body1
    body2"
| | | | | body[0]  (RubyCallNode)  SourceSection(source=ensure_lines.rb [3:1 - 3:9], index=16, length=9, characters=    body1)source: (16,24) line=3 len=9 text="    body1"
| | | | | | receiver  (SelfNode)  
| | | | | body[1]  (RubyCallNode)  SourceSection(source=ensure_lines.rb [4:1 - 4:9], index=26, length=9, characters=    body2)source: (26,34) line=4 len=9 text="    body2"
| | | | | | receiver  (SelfNode)  
| | | | ensurePart  (SequenceNode)  SourceSection(source=ensure_lines.rb [6:1 - 7:15], index=45, length=31, characters=    guaranteed1\n    guaranteed2)source: (45,75) line=6 len=31 text="    guaranteed1
    guaranteed2"
| | | | | body[0]  (RubyCallNode)  SourceSection(source=ensure_lines.rb [6:1 - 6:15], index=45, length=15, characters=    guaranteed1)source: (45,59) line=6 len=15 text="    guaranteed1"
| | | | | | receiver  (SelfNode)  
| | | | | body[1]  (RubyCallNode)  SourceSection(source=ensure_lines.rb [7:1 - 7:15], index=61, length=15, characters=    guaranteed2)source: (61,75) line=7 len=15 text="    guaranteed2"
| | | | | | receiver  (SelfNode) 

[eregon]

Fix in #2761