The OP's idea is the best one so far. What about the following.
r, err := os.Open("blah.txt")
*return* nil *if* r == nil, err *if* err != nil
basically every return field could be followed by an optional if clause
with an expression that must evaluate to bool.
The return only happens if all optional if clauses evaluate to true.
Could be also used to bubble errors up the stack
r, err := os.Open("blah.txt")
*return* nil, fmt.Errorf("File open failed") *if* err != nil
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