more pretty print fixes

printer.go

@@ -301,10 +301,15 @@ func printerBuildType(from *ast.Type) (gAst.Type, error) {
 
 	// check if we have a list
 	if from.Elem != nil {
+		innerType, err := printerBuildType(from.Elem)
+		if err != nil {
+			return nil, err
+		}
+
 		// wrap the element in a list
 		finalType = &gAst.List{
 			Kind: "List",
-			Type: finalType,
+			Type: innerType,
 		}
 	}
 

printer_test.go

@@ -632,6 +632,29 @@ fragment Foo on User {
 				},
 				},
 			},
+		}, {
+			`query foo($id: [String!]) {
+  hello
+}
+`,
+			&ast.QueryDocument{
+				Operations: ast.OperationList{&ast.OperationDefinition{
+					Operation: ast.Query,
+					Name:      "foo",
+					SelectionSet: ast.SelectionSet{
+						&ast.Field{
+							Name: "hello",
+						},
+					},
+					VariableDefinitions: ast.VariableDefinitionList{
+						&ast.VariableDefinition{
+							Variable: "id",
+							Type:     ast.ListType(ast.NonNullNamedType("String", &ast.Position{}), &ast.Position{}),
+						},
+					},
+				},
+				},
+			},
 		},
 		// single mutation field
 		{