x/website: Getting Started tutorial doesn't work with Go 1.16

[FiloSottile]

The Getting Started tutorial relies on go run modifying the go.mod automatically, which is now deprecated.

hello.go:5:8: no required module provides package rsc.io/quote; try 'go mod tidy' to add it

The tutorial should instruct the user to run go get immediately before editing the code or go mod tidy after editing the code.

/cc @stevetraut

[cagedmantis]

/cc @dmitshur

[dmitshur]

Issue #43430 is related. CC @jayconrod.

Based on the discussion there, I suspect we prefer suggesting go get over go mod tidy for the specific task of adding new dependencies. (go mod tidy is fine to use for other module management, like removing unused dependencies.)

[jayconrod]

I think at tip we recommend go get instead of go mod tidy. In any case, the text will need to be updated.

I'll take a look soon after 1.16 release blockers are resolved.

[FiloSottile]

I just noticed that starting in Go 1.16, go run . doesn't work without a module, too.

https://golang.org/cl/283635 replaced go run hello.go with go run ., so that part will break with Go 1.16 too. My suggestion would be to introduce a go mod init earlier, because I think modules is something every developer will encounter in the first hour, while the command-line-arguments package is not something they need to know about at all, and can only confuse them. Alternatively, the CL can be rolled back.

[gopherbot]

Change https://golang.org/cl/288277 mentions this issue: content: improve getting started document