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Here's the plan for the mutator: https://go.googlesource.com/proposal/+/master/design/draft-fuzzing.md#fuzzing-engine-and-mutator https://go.googlesource.com/pr

• greyface- 5y ago
  And the code: https://github.com/golang/go/blob/dev.fuzz/src/internal/fuzz/mutator.go https://github.com/golang/go/blob/dev.fuzz/src/internal/fuzz... Edit: and here's the mechanism that guides mutations towards increased coverage: https://github.com/golang/go/blob/5542c10fbf19cb199d1659c18963f9ed83570746/src/internal/fuzz/fuzz.go#L244 https://github.com/golang/go/blob/5542c10fbf19cb199d1659c189...