[Mono-bugs] [Bug 74114][Nor] New - [GMCS]Cannot call new on a generic struct type without new constraint

bugzilla-daemon@bugzilla.ximian.com bugzilla-daemon@bugzilla.ximian.com
Sat, 26 Mar 2005 12:26:44 -0500 (EST)

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Changed by marcus@cuda.org.


--- shadow/74114	2005-03-26 12:26:44.000000000 -0500
+++ shadow/74114.tmp.18122	2005-03-26 12:26:44.000000000 -0500
@@ -0,0 +1,50 @@
+Bug#: 74114
+Product: Mono: Compilers
+Version: 1.1
+OS: SUSE 9.2
+OS Details: 
+Status: NEW   
+Priority: Normal
+Component: C#
+AssignedTo: mono-bugs@ximian.com                            
+ReportedBy: marcus@cuda.org               
+QAContact: mono-bugs@ximian.com
+TargetMilestone: ---
+Summary: [GMCS]Cannot call new on a generic struct type without new constraint
+Description of Problem:
+Note: This is marked as resolved in bug #68326, the problem still exists in
+mono 1.1.5
+You cannot call new on a generic stuct type (that is a generic type with a
+struct constaint) without specifing a new constraint. See code below. Since
+a struct always has a default constructor, the new constraint is not
+needed. MS .NET 2.0 (Feb CTP) does not require the new constraint and will
+not compile with it (Error: The 'new()' constraint cannot be used with the
+'struct' constraint).
+Steps to reproduce the problem:
+Try to compile this code
+class Test<T> where T: struct{
+   public Test(){
+      T s = new T();
+   }
+Actual Results:
+using mono 1.1.5
+test.cs(3) error CS0304: Cannot create an instance of the variable type 'T'
+because it doesn't have the new() constraint 
+Expected Results:
+should compile fine
+How often does this happen? 
+Additional Information: