public EECompilationContextMethod(CSharpCompilation compilation, MethodSymbol underlyingMethod)
{
Debug.Assert(underlyingMethod.IsDefinition);
_compilation = compilation;
var typeMap = underlyingMethod.ContainingType.TypeSubstitution ?? TypeMap.Empty;
typeMap.WithAlphaRename(underlyingMethod, this, out _typeParameters);
_underlyingMethod = underlyingMethod.ConstructIfGeneric(TypeArgumentsWithAnnotations);
_parameters = SynthesizedParameterSymbol.DeriveParameters(_underlyingMethod, this);
}