Swift: Connect it up.

Author: geoffw0

swift/ql/lib/codeql/swift/elements/type/TypeAliasType.qll

@@ -10,7 +10,7 @@ class TypeAliasType extends Generated::TypeAliasType {
    * typealias MyInt = Int
    * ```
    */
-  Type getAliasedType() { none() } // TODO: not yet implemented.
+  Type getAliasedType() { result = this.getDecl().getAliasedType() }
 
-  override Type getUnderlyingType() { result = this } // TODO: not yet implemented.
+  override Type getUnderlyingType() { result = this.getAliasedType().getUnderlyingType() }
 }

swift/ql/test/extractor-tests/declarations/all.ql

@@ -1,8 +1,7 @@
 import swift
 
 string describe(Decl decl) {
-  //result = "getAliasedType:" + decl.(TypeAliasDecl).getAliasedType().toString() TODO: not yet implemented
-  none()
+  result = "getAliasedType:" + decl.(TypeAliasDecl).getAliasedType().toString()
 }
 
 from Decl decl

swift/ql/test/library-tests/elements/type/nominaltype/nominaltypedecl.ql

@@ -1,8 +1,8 @@
 import swift
 
 string describe(TypeDecl td) {
-  //result = "getAliasedType:" + td.(TypeAliasDecl).getAliasedType() TODO: not yet implemented.
-  //or
+  result = "getAliasedType:" + td.(TypeAliasDecl).getAliasedType()
+  or
   result = "getABaseType:" + td.(NominalTypeDecl).getABaseType()
 }