processor

type Instrumenter interface {
	Imports() []*types.Package
	PrefixStatements(spanName string, contextName string, hasError bool, errName string) []ast.Stmt
}

type Processor struct {
	Instrumenter                Instrumenter
	PreserveLineNumbers         bool // if true, use compile directives to preserve line numbers as if no instrumentation was applied
	SpanName                    func(receiver, function string) string
	ContextPackage, ContextType string // context is detected automatically based on matching package and symbol name
	ErrorType                   string // error is detected by error type
}