Fix: Type checking behavior on interface extension members #14488
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Resolves fsharp/issues/14480
An FS3536 warning was being emitted for extension methods on interfaces without static abstract members (SAM). This was due to some of the
MethInfo
logic which classifies any method on an interface type to be an abstract method declaration or virtual dispatch slot. Adding an explicit extension member check to theCheckIWSAM
function resolves the compiler warning issue.