and:
        buildFile << """
model {
    components {
        main(NativeExecutableSpec) {
            sources {
                sumAsm(AssemblerSourceSet) {
                    source {
                        srcDir "src/main/sum-sources"
                    }
                }
            }
        }
    }
}
"""

        when:

	symSiggen // type symbol has been generated
	symAsm    // on asmlist, for writing to -asmhdr
	symFunc   // function symbol
)

func (sym *Sym) OnExportList() bool { return sym.flags&symOnExportList != 0 }
func (sym *Sym) Uniq() bool         { return sym.flags&symUniq != 0 }
func (sym *Sym) Siggen() bool       { return sym.flags&symSiggen != 0 }
func (sym *Sym) Asm() bool          { return sym.flags&symAsm != 0 }

cd pkginroot
go mod init m
stderr '^go: to add module requirements and sums:\n\tgo mod tidy$'
cd ..

# 'go mod init' should recommend 'go mod tidy' if the directory has a
# subdirectory. We don't walk the tree to see if it has .go files.
cd subdir
go mod init m
stderr '^go: to add module requirements and sums:\n\tgo mod tidy$'
cd ..

-- empty/empty.txt --
Not a .go file. Still counts as an empty project.

# 'go mod tidy' should remove content sums for module versions that aren't
# in the build list. It should preserve go.mod sums for module versions that
# are in the module graph though.
# Verifies golang.org/issue/33008.
go mod tidy
! grep '^rsc.io/quote v1.5.0 h1:' go.sum
grep '^rsc.io/quote v1.5.0/go.mod h1:' go.sum

-- go.mod --
module m

go 1.15

require (
	rsc.io/quote v1.5.2
	example.com/r v0.0.0
)

func mergeSummaries(sums []pallocSum, logMaxPagesPerSum uint) pallocSum {
	// Merge the summaries in sums into one.
	//
	// We do this by keeping a running summary representing the merged
	// summaries of sums[:i] in start, most, and end.
	start, most, end := sums[0].unpack()
	for i := 1; i < len(sums); i++ {
		// Merge in sums[i].
		si, mi, ei := sums[i].unpack()

# attempting to update the file
cp incomplete-sum-file $WORK/overlay/overlay-sum-used-correct-sums
! go get -overlay overlay.json .
stderr '^go: updates to go.sum needed, but go.sum is part of the overlay specified with -overlay$'
cmp incomplete-sum-file $WORK/overlay/overlay-sum-used-correct-sums
! go mod tidy -overlay overlay.json

// WriteGoSum writes the go.sum file if it needs to be updated.
//
// keep is used to check whether a newly added sum should be saved in go.sum.
// It should have entries for both module content sums and go.mod sums
// (version ends with "/go.mod"). Existing sums will be preserved unless they
// have been marked for deletion with TrimGoSum.
func WriteGoSum(ctx context.Context, keep map[module.Version]bool, readonly bool) error {
	goSum.mu.Lock()

# This is a regression test for golang.org/issue/50036
# Don't check sums for other modules in the workspace.

cd m/sub
go install -n

-- go.work --
go 1.18

use (
    ./m
    ./m/sub
)
-- m/go.mod --
module example.com/m

go 1.18

-- m/m.go --
package m

func M() {}
-- m/sub/go.mod --
module example.com/m/sub

go 1.18

require example.com/m v1.0.0
-- m/sub/main.go --
package main

# Test adding sums to go.work.sum when sum isn't in go.mod.

go run .
cmp go.work.sum want.sum

-- want.sum --
golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c h1:pvCbr/wm8HzDD3fVywevekufpn6tCGPY3spdHeZJEsw=
golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
rsc.io/quote v1.5.2 h1:3fEykkD9k7lYzXqCYrwGAf7iNhbk4yCjHmKBN9td4L0=
rsc.io/quote v1.5.2/go.mod h1:LzX7hefJvL54yjefDEDHNONDjII0t9xZLPXsUe+TKr0=

# Regression test for Issue #62663: we would filter out the toolchain and
# main modules from the build list incorrectly, leading to the workspace
# modules being checked for correct sums. Specifically this would happen when
# the module name sorted after the virtual 'go' version module name because
# it could not get chopped off when we removed the MainModules.Len() modules
# at the beginning of the build list and we would remove the go module instead.

go mod verify