gotools/go/analysis/checker/print.go

// PrintText emits diagnostics as plain text to w.
//
// If contextLines is nonnegative, it also prints the
// offending line, plus that many lines of context
// before and after the line.
func (g *Graph) PrintText(w io.Writer, contextLines int) error { … }

func writeTextDiagnostics(w io.Writer, roots []*Action, contextLines int) error { … }

// PrintJSON emits diagnostics in JSON form to w.
// Diagnostics are shown only for the root nodes,
// but errors (if any) are shown for all dependencies.
func (g *Graph) PrintJSON(w io.Writer) error { … }

func writeJSONDiagnostics(w io.Writer, roots []*Action) error { … }