Operations may include identifying an edit that corresponds to a fault of a program. The edit may be identified based on a difference between the program and an improved program. The operations may include obtaining an AST that represents the program and includes defect nodes that correspond to a fault location and include an edit node. The operations may include classifying a particular node as a primary node that operates as a starting point for the edit. The operations may include identifying a path from the primary node to the edit node. The operations may include generating a fix pattern based on the path and the edit. The operations may include performing repairs with respect to an identified fault of code. The repairs may be performed using the fix pattern and based on the identified fault of the code being the same type as the fault of the program.