Address some PROTOTYPE comments

[AlekseyTs]

No description provided.

[AlekseyTs]

@cston, @dotnet/roslyn-compiler For the second review

[AlekseyTs]

@cston, @dotnet/roslyn-compiler For the second review

[cston]

            );

Should an error be reported for --x? #Resolved

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Refers to: src/Compilers/CSharp/Test/Emit3/Symbols/UserDefinedCompoundAssignmentOperatorsTests.cs:5341 in 0ae0889. [](commit_id = 0ae0889, deletion_comment = False)

[cston]

    }

Should we verify expected errors using the operators in C2, ..., C6, when called with operator syntax and with the explicit name? #Resolved

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Refers to: src/Compilers/CSharp/Test/Emit3/Symbols/UserDefinedCompoundAssignmentOperatorsTests.cs:7476 in 0ae0889. [](commit_id = 0ae0889, deletion_comment = False)

[AlekseyTs]

            );

Should an error be reported for --x?

There is an error on the declaration and, as we can observe below, the -- symbol doesn't have __arglist even when the syntax has it. BTW, the feature implementation didn't change the way __arglist is handled on parameters

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In reply to: 2825074255

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Refers to: src/Compilers/CSharp/Test/Emit3/Symbols/UserDefinedCompoundAssignmentOperatorsTests.cs:5341 in 0ae0889. [](commit_id = 0ae0889, deletion_comment = False)

[AlekseyTs]

    }

Should we verify expected errors using the operators in C2, ..., C6, when called with operator syntax and with the explicit name?

I do not see any benefit in this for the purpose of this PR. Methods with MethodKind.Ordinary are not considered operators and there is nothing special about consuming them.

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In reply to: 2825110362

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Refers to: src/Compilers/CSharp/Test/Emit3/Symbols/UserDefinedCompoundAssignmentOperatorsTests.cs:7476 in 0ae0889. [](commit_id = 0ae0889, deletion_comment = False)