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The embed spec allows for //go:embed to be used in files that underscore-import package "embed". This is useful for embeds to []byte and string vars because the embed.FS type may not be referenced if those are the only types of embeds in a file. Because the compiler previously checked whether there were any aliases to the embed package to decide if //go:embed could be used, it would reject files with only underscore imports of embed. Instead, record whether the embed import is encountered at all, similar to what is done with unsafe, to decide whether //go:embed is allowed. Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/297553
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