var github.com/yuin/goldmark/extension.GFM

3 uses

	github.com/yuin/goldmark/extension (current package)
		gfm.go#L11: var GFM = &gfm{}

	golang.org/x/pkgsite/internal/frontend
		readme.go#L117: 			extension.GFM, // Support Github Flavored Markdown.
		styleguide.go#L115: 		goldmark.WithExtensions(extension.GFM),

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