gopls/doc: include instructions for compiling generic code
Change-Id: Ia7855890c72f9e376816a7c2d71f9715c7f2eb9f
Reviewed-on: https://go-review.googlesource.com/c/tools/+/330369
Trust: Robert Findley <rfindley@google.com>
Run-TryBot: Robert Findley <rfindley@google.com>
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
gopls-CI: kokoro <noreply+kokoro@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
diff --git a/gopls/doc/advanced.md b/gopls/doc/advanced.md
index dbaf21c..0fa1139 100644
--- a/gopls/doc/advanced.md
+++ b/gopls/doc/advanced.md
@@ -62,4 +62,12 @@
$ GO111MODULE=on gotip get -tags=typeparams golang.org/x/tools/gopls@master golang.org/x/tools@master
```
+This will build a version of gopls that understands generic code. To actually
+run the generic code you develop, you must also tell the compiler to speak
+generics using the `-G=3` compiler flag. For example
+
+```
+$ gotip run -gcflags=-G=3 .
+```
+
[Go project]: https://go.googlesource.com/go
