[Mono-dev] Generic Constraints Regression in 2.8

Tom Philpot tom.philpot at logos.com
Sun Nov 14 22:16:52 EST 2010

The following code compiled with a warning on Mono 2.7 (as of 147679)  but has  an error in 2.8.

namespace Application
public class Z {}

public class A<X, Y>
where Y : Z
where X : Y
protected void SomeOperation(Y y)
X x = y as X;

public class Foo { public static void Main() {} }

/opt/mono-2.8/bin/gmcs CS0413Regression.cs
CS0413Regression.cs(12,33): error CS0413: The `as' operator cannot be used with a non-reference type parameter `X'. Consider adding `class' or a reference type constraint
Compilation failed: 1 error(s), 0 warnings

/opt/mono-r147679/bin/gmcs CS0413Regression.cs
CS0413Regression.cs(12,27): warning CS0219: The variable `x' is assigned but its value is never used
Compilation succeeded - 1 warning(s)

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