Allow unexpected nodes at the end of a node

Author: ahoppen

Sources/SwiftSyntax/Raw/gyb_generated/RawSyntaxNodes.swift

@@ -17,6 +17,6 @@
 extension SyntaxParser {
   static func verifyNodeDeclarationHash() -> Bool {
     return String(cString: swiftparse_syntax_structure_versioning_identifier()!) ==
-      "7833dde6a3aefe03e10857eefc2c0f9b4b1a21a6"
+      "3d951982c9bab064e46e7f1578b92a06bc1170f1"
   }
 }

Sources/SwiftSyntax/Raw/gyb_generated/RawSyntaxValidation.swift

@@ -28,11 +28,13 @@ def __init__(self, name, name_for_diagnostics, description=None, kind=None,
         self.children = []
         # Add implicitly generated UnexpectedNodes children in between any two
         # defined children
-        if kind != 'SyntaxCollection':
-            for i in range(2 * len(children)):
+        if kind != 'SyntaxCollection' and len(children) > 0:
+            for i in range(2 * len(children) + 1):
                 if i % 2 == 0:
                     if i == 0:
                         name = 'UnexpectedBefore' + children[0].name
+                    elif i == 2 * len(children):
+                        name = 'UnexpectedAfter' + children[-1].name
                     else:
                         name = 'UnexpectedBetween%sAnd%s' % \
                             (children[int(i / 2) - 1].name, children[int(i / 2)].name)