Fix test to gave almost the same results

Author: owen-mc

go/ql/test/library-tests/semmle/go/Types/StructFields.expected

@@ -1,5 +1,5 @@
-| aliases.go:19:6:19:7 | S3 | aliases.go:6:18:6:37 | struct type | x | int |
-| aliases.go:19:6:19:7 | S3 | aliases.go:8:18:8:37 | struct type | x | int |
+| aliases.go:19:6:19:7 | S3 | aliases.go:6:18:6:37 | struct type | x | aliasesX |
+| aliases.go:19:6:19:7 | S3 | aliases.go:8:18:8:37 | struct type | x | aliasesY |
 | aliases.go:19:6:19:7 | S3 | aliases.go:19:9:19:23 | struct type | x | int |
 | cyclic.go:3:6:3:6 | s | cyclic.go:3:8:5:1 | struct type | s | * s |
 | cyclic.go:7:6:7:6 | t | cyclic.go:7:8:10:1 | struct type | f | int |

go/ql/test/library-tests/semmle/go/Types/StructFields.ql

@@ -2,6 +2,6 @@ import go
 
 from StructTypeExpr ste, NamedType named, string name, Type tp
 where
-  named.getUnderlyingType() = ste.getType() and
+  identicalUpToDeepUnaliasing(named.getUnderlyingType(), ste.getType()) and
   ste.getType().(StructType).hasField(name, tp)
 select named, ste, name, tp.pp()