public AlternativeMethodSignature(
@Nullable JetType returnType,
@Nullable JetType receiverType,
@NotNull List<ValueParameterDescriptor> valueParameters,
@NotNull List<TypeParameterDescriptor> typeParameters,
<BUG>@Nullable String signatureError
</BUG>
) {
<BUG>super(signatureError);
</BUG>
this.returnType = returnType;

public AlternativeMethodSignature(
@Nullable JetType returnType,
@Nullable JetType receiverType,
@NotNull List<ValueParameterDescriptor> valueParameters,
@NotNull List<TypeParameterDescriptor> typeParameters,
@NotNull List<String> signatureErrors
) {
super(signatureErrors);
this.returnType = returnType;
