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In MonoDevelop 3.0.2, create a new C# console project.
On the first line of a new C# file, type:
System.Linq does not appear in the suggestion list.
However, typing the following compiles okay:
It's a known issue - the project system should give the reference.
Known work around: Manually adding the system.core assembly.
Not convinced this is a bug. If the project doesn't have a reference to System.Core, then you can't reference types from System.Core. This is consistent.
The reason the compile succeeds is that MD implicitly adds a System.Core reference in order for certain C#3+ features to work correctly.