dotnet/roslyn
GitHub で見るConfusing error message for overloaded generic delegate-accepting method
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#8,603 opened on 2016年2月11日
Area-CompilersBugConcept-Diagnostic Clarityhelp wanted
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説明
I have the following code:
using System;
class Program
{
static void Main()
{
M(x => { });
}
static void M(string s)
{
}
static void M<T>(Action<T> a)
{
}
}
It produces the following error:
CS1660 Cannot convert lambda expression to type 'string' because it is not a delegate type
I think that a human can clearly see that the code is attempting to call the delegate-accepting overload, but is missing a type argument (M<int>(x => { });) or explicit parameter type (M((int x) => { });).
But the compiler shows error message that's related to the first (string-accepting) overload, which I think is confusing.