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+These files are processed by example_test.go:TestExamples.
+
+A .golden file is a txtar file with two sections for each example that should be
+created by doc.Examples from the corresponding .go file.
+
+One section, named EXAMPLE_NAME.Output, contains the example's output,
+the value of the field Example.Output.
+
+The other, named EXAMPLE_NAME.Play, contains the formatted code for a playable
+version of the example, the value of the field Example.Play.
+
+If a section is missing, it is treated as being empty.