I just encounter a problem that
```
Check failed: (!actual_type.defined()) is false: Expected type PrimExpr but got
relay.Var
```
Even though my new operator defined with
```
Expr MakeFun(Expr X1, Expr X2, Expr X3, DataType out_dtype)
```
My type relation function is written as
```
bool FunRel(const Array<Type>& types, int num_inputs, const Attrs& attrs,
const TypeReporter& reporter) {
CHECK_EQ(types.size(), 4);
​reporter->Assign(types[3], type[0]);
return true;
}
```
I just want the output type match the type of the first input (X1).
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