modfile: add support for dropping go and toolchain stmts

Also add tests of previous CLs.

For golang/go#57001.

Change-Id: I755429dd07c0e84910108ce9807d607115329b79
Reviewed-on: https://go-review.googlesource.com/c/mod/+/497400
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Bryan Mills <bcmills@google.com>
5 files changed
tree: 4350caad4f31b266f872288196509e720c590117
  1. gosumcheck/
  2. internal/
  3. modfile/
  4. module/
  5. semver/
  6. sumdb/
  7. zip/
  8. codereview.cfg
  9. go.mod
  10. go.sum
  11. LICENSE
  12. PATENTS
  13. README.md
README.md

mod

PkgGoDev

This repository holds packages for writing tools that work directly with Go module mechanics. That is, it is for direct manipulation of Go modules themselves.

It is NOT about supporting general development tools that need to do things like load packages in module mode. That use case, where modules are incidental rather than the focus, should remain in x/tools, specifically x/tools/go/packages.

The specific case of loading packages should still be done by invoking the go command, which remains the single point of truth for package loading algorithms.