Outline should exclude _ "blank identifier"

[mgood]

We use var _ in the top-level of some of our Go files for various reasons, most notably the "interface checks pattern" documented in Effective Go.

These should be excluded from the Outline view since they don't represent a real variable that can be referenced and they clutter the output.

For example this code will produce 3 entries for _ in the outline view:

package foo

var (
	_ io.Closer = Foo(nil)
	_ io.Closer = Bar(nil)
	_ io.Closer = Baz(nil)
)

[ramya-rao-a]

Good point. PRs are welcome.

Code Pointers:

• Checkout Building and Debugging the extension to learn how to set up a local dev version of the Go extension
• https://github.com/Microsoft/vscode-go/blob/0.6.88/src/goOutline.ts#L118 is the place where we can skip such symbols

[ramya-rao-a]

This issue has a PR:
#1893

[mgood]

Nice, thanks!

[ramya-rao-a]

This but is now fixed in the latest update to this extension (0.6.90)