Oops, remove more error_stack stuff.

This should be the last of it.

core/ui.py

@@ -135,21 +135,6 @@ def PrettyPrintError(parse_error, arena, f=sys.stderr):
   print(parse_error.UserErrorString(), file=f)
 
 
-def PrintErrorStack(error_stack, arena, f=sys.stderr):
-  """
-  NOTE:
-  - Parse errors always occur within a single arena.  Actually NO, you want to
-    show the 'source' stack trace like Python shows the import stack trace.
-
-  - Runtime errors may span arenas (e.g. the function stack).
-  """
-  # - parse errors happen at runtime because of 'source'
-  #   - should there be a distinction then?
-  for err in error_stack:
-    PrettyPrintError(err, arena, f=f)
-    print('---', file=f)
-
-
 def PrintAst(nodes, opts):
   if len(nodes) == 1:
     node = nodes[0]

osh/bool_parse.py

@@ -60,8 +60,6 @@ def __init__(self, w_parser):
     self.op_id = Id.Undefined_Tok
     self.b_kind = Kind.Undefined
 
-    self.error_stack = []
-
   def _NextOne(self, lex_mode=lex_mode_e.DBRACKET):
     n = len(self.words)
     if n == 2:

osh/cmd_parse.py

@@ -272,7 +272,6 @@ def Reset(self):
 
     Called by the interactive loop.
     """
-    self.error_stack = []
     self.completion_stack = []
 
     # Cursor state set by _Peek()
@@ -283,6 +282,9 @@ def Reset(self):
 
     self.pending_here_docs = []
 
+  def Error(self):
+    return 'TODO: for completion'
+
   def ResetInputObjects(self):
     """Reset the internal state of our inputs.
 
@@ -292,9 +294,6 @@ def ResetInputObjects(self):
     self.lexer.ResetInputObjects()
     self.line_reader.Reset()
 
-  def Error(self):
-    return self.error_stack
-
   def GetCompletionState(self):
     return self.completion_stack