x/pkgsite: package level Example quotes entire file, not just function code

[mroth]

What is the URL of the page with the issue?

https://pkg.go.dev/github.com/mroth/weightedrand@v0.2.2?tab=doc#example-package

What is your user agent?

Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_5) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.1.1 Safari/605.1.15

Screenshot

Package Example function in godoc.org:

Package Example unction in pkg.go.dev:

(snipped...)

What did you do?

Use a package level Example function in the godocs for a module.

What did you expect to see?

The example code and output for the Example function only rendered at the top of the package documentation page.

What did you see instead?

The "code" section of the example function contains the source of the entire file, not just the Example function.

[mvdan]

Possibly related to (or even a duplicate of) #39006.

[gopherbot]

Change https://golang.org/cl/239180 mentions this issue: internal/fetch/internal/doc: fix detection of whole file examples