Getter-only auto properties is a new language feature in C# 6.0. See http://blogs.msdn.com/b/csharpfaq/archive/2014/11/20/new-features-in-c-6.aspx.
The bug is, when using getter-only auto properties, which the name of property is the same with some class, CS0118 and CS0131 will occur.
The attached test file can be compiled in Visual Studio 2015 RC developer command prompt, but can not in Mono command prompt.
D:\>csc /target:library test.cs
Microsoft (R) Visual C# Compiler version 18.104.22.168411
Copyright (C) Microsoft Corporation. All rights reserved.
d:\>mcs -target:library test.cs
test.cs(16,9): error CS0118: `Foo' is a `type' but a `variable' was expected
test.cs(16,9): error CS0131: The left-hand side of an assignment must be a variable, a property or an indexer
Compilation failed: 2 error(s), 0 warnings
Created attachment 11318 [details]
*** This bug has been marked as a duplicate of bug 29691 ***