[libSyntax] Accept non-standard accessor kinds

Author: ahoppen

test/Syntax/Outputs/round_trip_parse_gen.swift.withkinds

@@ -107,7 +107,12 @@ class C <MemberDeclBlock>{<MemberDeclListItem><FunctionDecl>
   private </DeclModifier>deinit <CodeBlock>{}</CodeBlock></DeinitializerDecl></MemberDeclListItem><MemberDeclListItem><SubscriptDecl><DeclModifier>
 
   internal </DeclModifier>subscript<ParameterClause>(<FunctionParameter>x: <SimpleTypeIdentifier>Int</SimpleTypeIdentifier></FunctionParameter>) </ParameterClause><ReturnClause>-> <SimpleTypeIdentifier>Int </SimpleTypeIdentifier></ReturnClause><AccessorBlock>{ <AccessorDecl>get <CodeBlock>{} </CodeBlock></AccessorDecl><AccessorDecl>set <CodeBlock>{} </CodeBlock></AccessorDecl>}</AccessorBlock></SubscriptDecl></MemberDeclListItem><MemberDeclListItem><SubscriptDecl>
-  subscript<ParameterClause>() </ParameterClause><ReturnClause>-> <SimpleTypeIdentifier>Int </SimpleTypeIdentifier></ReturnClause><AccessorBlock>{ <ReturnStmt>return <IntegerLiteralExpr>1 </IntegerLiteralExpr></ReturnStmt>}</AccessorBlock></SubscriptDecl></MemberDeclListItem>
+  subscript<ParameterClause>() </ParameterClause><ReturnClause>-> <SimpleTypeIdentifier>Int </SimpleTypeIdentifier></ReturnClause><AccessorBlock>{ <ReturnStmt>return <IntegerLiteralExpr>1 </IntegerLiteralExpr></ReturnStmt>}</AccessorBlock></SubscriptDecl></MemberDeclListItem><MemberDeclListItem><VariableDecl>
+
+  var <PatternBinding><IdentifierPattern>x</IdentifierPattern><TypeAnnotation>: <SimpleTypeIdentifier>Int </SimpleTypeIdentifier></TypeAnnotation><AccessorBlock>{<FunctionCallExpr><IdentifierExpr>
+    address </IdentifierExpr><ClosureExpr>{ <FunctionCallExpr><IdentifierExpr>fatalError</IdentifierExpr>() </FunctionCallExpr>}</ClosureExpr></FunctionCallExpr><FunctionCallExpr><IdentifierExpr>
+    unsafeMutableAddress </IdentifierExpr><ClosureExpr>{ <FunctionCallExpr><IdentifierExpr>fatalError</IdentifierExpr>() </FunctionCallExpr>}</ClosureExpr></FunctionCallExpr>
+  }</AccessorBlock></PatternBinding></VariableDecl></MemberDeclListItem>
 }</MemberDeclBlock></ClassDecl><ProtocolDecl>
 
 protocol PP <MemberDeclBlock>{<MemberDeclListItem><AssociatedtypeDecl>

test/Syntax/round_trip_parse_gen.swift

@@ -108,6 +108,11 @@ class C {
 
   internal subscript(x: Int) -> Int { get {} set {} }
   subscript() -> Int { return 1 }
+
+  var x: Int {
+    address { fatalError() }
+    unsafeMutableAddress { fatalError() }
+  }
 }
 
 protocol PP {

utils/gyb_syntax_support/DeclNodes.py

@@ -476,7 +476,12 @@
              Child('Modifier', kind='DeclModifier', is_optional=True),
              Child('AccessorKind', kind='Token',
                    text_choices=[
-                      'get', 'set', 'didSet', 'willSet',
+                      'get', 'set', 'didSet', 'willSet', 'unsafeAddress', 
+                      'addressWithOwner', 'addressWithNativeOwner', 
+                      'addressWithPinnedNativeOwner', 'unsafeMutableAddress', 
+                      'mutableAddressWithOwner', 
+                      'mutableAddressWithNativeOwner', 
+                      'mutableAddressWithPinnedNativeOwner',
                    ]),
              Child('Parameter', kind='AccessorParameter', is_optional=True),
              Child('Body', kind='CodeBlock', is_optional=True),