Add more tests.

src/Compilers/CSharp/Test/Symbol/Compilation/CompilationAPITests.cs

@@ -2318,6 +2318,8 @@ public void CreateAnonymousType1()
             Assert.True(type.IsAnonymousType);
             Assert.Equal(1, type.GetMembers().OfType<IPropertySymbol>().Count());
             Assert.Equal("<anonymous type: int m1>", type.ToDisplayString());
+            Assert.All(type.GetMembers().OfType<IPropertySymbol>().Select(p => p.Locations.FirstOrDefault()), 
+                loc => Assert.Equal(loc, Location.None));
         }
 
         [Fact()]
@@ -2352,6 +2354,8 @@ public void CreateAnonymousType2()
             Assert.True(type.IsAnonymousType);
             Assert.Equal(2, type.GetMembers().OfType<IPropertySymbol>().Count());
             Assert.Equal("<anonymous type: int m1, bool m2>", type.ToDisplayString());
+            Assert.All(type.GetMembers().OfType<IPropertySymbol>().Select(p => p.Locations.FirstOrDefault()),
+                loc => Assert.Equal(loc, Location.None));
         }
 
         #region Script return values

src/Compilers/VisualBasic/Test/Semantic/Compilation/CompilationAPITests.vb

@@ -1340,6 +1340,8 @@ BC2014: the value '_' is invalid for option 'RootNamespace'
             Assert.True(type.IsAnonymousType)
             Assert.Equal(2, type.GetMembers().OfType(Of IPropertySymbol).Count())
             Assert.Equal("<anonymous type: m1 As Integer, m2 As Integer>", type.ToDisplayString())
+            Assert.All(type.GetMembers().OfType(Of IPropertySymbol)().Select(Function(p) p.Locations.FirstOrDefault()),
+                Sub(loc) Assert.Equal(loc, Location.None))
         End Sub
 
         <Fact>
@@ -1385,6 +1387,8 @@ BC2014: the value '_' is invalid for option 'RootNamespace'
             Assert.True(type.IsAnonymousType)
             Assert.Equal(1, type.GetMembers().OfType(Of IPropertySymbol).Count())
             Assert.Equal("<anonymous type: Key m1 As Integer>", type.ToDisplayString())
+            Assert.All(type.GetMembers().OfType(Of IPropertySymbol)().Select(Function(p) p.Locations.FirstOrDefault()),
+                Sub(loc) Assert.Equal(loc, Location.None))
         End Sub
 
         <Fact()>
@@ -1398,6 +1402,8 @@ BC2014: the value '_' is invalid for option 'RootNamespace'
             Assert.True(type.IsAnonymousType)
             Assert.Equal(1, type.GetMembers().OfType(Of IPropertySymbol).Count())
             Assert.Equal("<anonymous type: m1 As Integer>", type.ToDisplayString())
+            Assert.All(type.GetMembers().OfType(Of IPropertySymbol)().Select(Function(p) p.Locations.FirstOrDefault()),
+                Sub(loc) Assert.Equal(loc, Location.None))
         End Sub
 
         <Fact()>
@@ -1410,6 +1416,8 @@ BC2014: the value '_' is invalid for option 'RootNamespace'
             Assert.True(type.IsAnonymousType)
             Assert.Equal(2, type.GetMembers().OfType(Of IPropertySymbol).Count())
             Assert.Equal("<anonymous type: Key m1 As Integer, Key m2 As Boolean>", type.ToDisplayString())
+            Assert.All(type.GetMembers().OfType(Of IPropertySymbol)().Select(Function(p) p.Locations.FirstOrDefault()),
+                Sub(loc) Assert.Equal(loc, Location.None))
         End Sub
 
         <Fact()>