Rename struct to class per #651 (#765)

executable_semantics/testdata/class1.carbon

@@ -2,7 +2,7 @@
 // Exceptions. See /LICENSE for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 
-struct Point {
+class Point {
   var x: i32;
   var y: i32;
 }

executable_semantics/testdata/class2.carbon

@@ -2,7 +2,7 @@
 // Exceptions. See /LICENSE for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 
-struct Point {
+class Point {
   var x: i32;
   var y: i32;
 }

executable_semantics/testdata/class3.carbon

@@ -2,7 +2,7 @@
 // Exceptions. See /LICENSE for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 
-struct Point {
+class Point {
   var x: i32;
   var y: i32;
 }

executable_semantics/testdata/class_field_access_mismatch.carbon

@@ -2,7 +2,7 @@
 // Exceptions. See /LICENSE for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 
-struct Point {
+class Point {
   var x: i32;
   var y: i32;
 }

executable_semantics/testdata/class_field_access_mismatch.golden

@@ -0,0 +1,2 @@
+COMPILATION ERROR: 11: class Point does not have a field named z
+EXIT CODE: 255

executable_semantics/testdata/class_field_mismatch.carbon

@@ -2,7 +2,7 @@
 // Exceptions. See /LICENSE for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 
-struct Point {
+class Point {
   var x: i32;
   var y: i32;
 }

executable_semantics/testdata/class_field_missing.carbon

@@ -2,7 +2,7 @@
 // Exceptions. See /LICENSE for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 
-struct Point {
+class Point {
   var x: i32;
   var y: i32;
 }

executable_semantics/testdata/struct_field_access_mismatch.golden

@@ -1,2 +0,0 @@
-COMPILATION ERROR: 11: struct Point does not have a field named z
-EXIT CODE: 255