[Mono-bugs] [Bug 396530] New: incorrect CS0029 for some combination of lambda expression and generic delegate

[bugzilla_noreply at novell.com]

https://bugzilla.novell.com/show_bug.cgi?id=396530

User atsushi at ximian.com added comment
https://bugzilla.novell.com/show_bug.cgi?id=396530#c392448

           Summary: incorrect CS0029 for some combination of lambda
                    expression and generic delegate
           Product: Mono: Compilers
           Version: SVN
          Platform: i586
        OS/Version: Windows
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: C#
        AssignedTo: mono-bugs at lists.ximian.com
        ReportedBy: atsushi at ximian.com
         QAContact: mono-bugs at lists.ximian.com
          Found By: Community of Practice


The following code does not compile due to some problem around lambda
expression and generic delegate:

--------
using System;

static class Test
{
    public static void Foo<T1, T2, TResult>(
        T1 arg1, T2 arg2, Func<T1, T2, TResult> func)
    {
        Bar(arg1, arg2, (a, b, _) => func(a, b));
    }
    public static void Bar<T1, T2, TResult>(
        T1 arg1, T2 arg2, Func<T1, T2, int, TResult> func)
    {
    }
    public static void Main(string[] args)
    {
    }
}
--------

Actual result:

$ gmcs nyaruru2.cs
nyaruru2.cs(8,38): error CS0029: Cannot implicitly convert type `TResult' to
`TR
esult'
nyaruru2.cs(8,38): The generic parameter `TResult' of
`Test.Foo<T1,T2,TResult>(T1, T2, System.Func<T1,T2,TResult>)' cannot be
converted to the generic parameter
 `TResult' of `Test.<>c__CompilerGenerated0<T1,T2,TResult>' (in the previous
error)
nyaruru2.cs(8,38): error CS1662: Cannot convert `lambda expression' to delegate
type `System.Func<T1,T2,int,TResult>' because some of the return types in the
block are not implicitly convertible to the delegate return type
Compilation failed: 2 error(s), 0 warnings


It may be the same reason for bug #392448 but I'm not sure.


-- 
Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are the QA contact for the bug.
You are the assignee for the bug.