Merge pull request swiftlang#34292 from rintaro/revert-pr33948

Revert "Implements SR-11580"

Author: rintaro

utils/gyb_syntax_support/ExprNodes.py

@@ -208,8 +208,7 @@
     Node('FloatLiteralExpr', kind='Expr',
          children=[
              Child('FloatingDigits', kind='FloatingLiteralToken'),
-         ],
-         must_uphold_invariant=True),
+         ]),
 
     Node('TupleExpr', kind='Expr',
          traits=['Parenthesized'],
@@ -283,8 +282,7 @@
     Node('IntegerLiteralExpr', kind='Expr',
          children=[
              Child('Digits', kind='IntegerLiteralToken'),
-         ],
-         must_uphold_invariant=True),
+         ]),
 
     # true or false
     Node('BooleanLiteralExpr', kind='Expr',

utils/gyb_syntax_support/Node.py

@@ -19,8 +19,7 @@ class Node(object):
 
     def __init__(self, name, description=None, kind=None, traits=None,
                  children=None, element=None, element_name=None,
-                 element_choices=None, omit_when_empty=False,
-                 must_uphold_invariant=False):
+                 element_choices=None, omit_when_empty=False):
         self.syntax_kind = name
         self.swift_syntax_kind = lowercase_first_word(name)
         self.name = kind_to_type(self.syntax_kind)
@@ -40,8 +39,6 @@ def __init__(self, name, description=None, kind=None, traits=None,
 
         self.omit_when_empty = omit_when_empty
         self.collection_element = element or ""
-        self.must_uphold_invariant = must_uphold_invariant
-
         # For SyntaxCollections make sure that the element_name is set.
         assert(not self.is_syntax_collection() or element_name or
                (element and element != 'Syntax'))