func prepareFreeWorkbufs() {
	lock(&work.wbufSpans.lock)
	if work.full != 0 {
		throw("cannot free workbufs when work.full != 0")
	}
	// Since all workbufs are on the empty list, we don't care
	// which ones are in which spans. We can wipe the entire empty
	// list and move all workbuf spans to the free list.
	work.empty = 0
	work.wbufSpans.free.takeAll(&work.wbufSpans.busy)
	unlock(&work.wbufSpans.lock)
}

    @Override
    public AfterExecutionResult execute(UnitOfWork work, C context) {
        return context.getCachingState().fold(
            cachingEnabled -> executeWithCache(work, context, cachingEnabled.getCacheKeyCalculatedState().getKey()),
            cachingDisabled -> executeWithoutCache(work, context)
        );
    }

    private AfterExecutionResult executeWithCache(UnitOfWork work, C context, BuildCacheKey cacheKey) {

    }

    @Override
    public R execute(UnitOfWork work, C context) {
        return delegate.execute(work, createIdentityContext(work, context));
    }

    @Override
    public <T> Deferrable<Try<T>> executeDeferred(UnitOfWork work, C context, Cache<Identity, IdentityCacheResult<T>> cache) {
        return delegate.executeDeferred(work, createIdentityContext(work, context), cache);
    }

    @Nonnull

# Test case for #67623 in go.work files: make sure the errors are
# printed on lines starting with file and line number so they
# can be easily parsed by tools.

cp go.work.repeated.txt go.work
! go list
stderr '^go.work:4: path .* appears multiple times in workspace$'

cp go.work.badgodebug.txt go.work
! go list
stderr '^go.work:3: unknown godebug "foo"$'

cp go.work.unparsable.txt go.work
! go list

cmp $WORK/modules-1.13.txt vendor/modules.txt

go list -mod=vendor -f {{.Dir}} -tags tools -e all
stdout '^'$WORK'[/\\]auto$'
stdout '^'$WORK'[/\\]auto[/\\]vendor[/\\]example.com[/\\]printversion$'
stdout '^'$WORK'[/\\]auto[/\\]vendor[/\\]example.com[/\\]version$'

# When the version is upgraded to 1.14, 'go mod vendor' should write a
# vendor/modules.txt with the updated 1.14 annotations.
go mod edit -go=1.14
go mod vendor

mkdir $WORK/other/bin
symlink $WORK/other/bin/go$GOEXE -> $WORK/new/bin/go$GOEXE
exec $WORK/bin/check$GOEXE $WORK/new/bin/go$GOEXE $WORK/new

rm $WORK/new/pkg

# Runtime GOROOT:
# Binaries built in the new tree should report the
# new tree when they call runtime.GOROOT.
symlink $WORK/new/src -> $TESTGOROOT/src
symlink $WORK/new/pkg -> $TESTGOROOT/pkg

                : calculateCachingStateWithNoCapturedInputs(work));

        cachingState.apply(
            enabled -> logCacheKey(enabled.getCacheKeyCalculatedState().getKey(), work),
            disabled -> logDisabledReasons(disabled.getDisabledReasons(), work)
        );

        UpToDateResult result = executeDelegate(work, context, cachingState);
        return new CachingResult(result, cachingState);
    }

cat q/go.mod
cp go.work.21 go.work
go list -f '{{.Module.GoVersion}} {{.DefaultGODEBUG}}'
! stdout panicnil
stdout randautoseed=0
rm go.work

# Go 1.20 workspace with Go 1.21 module cannot happen.
cp go.work.20 go.work
cp go.mod.21 go.mod
! go list -f '{{.Module.GoVersion}} {{.DefaultGODEBUG}}'
stderr 'go: module . listed in go.work file requires go >= 1.21'
rm go.work

        when:
        def result = step.execute(work, context)

        then:
        result == delegateResult

        _ * work.executionBehavior >> UnitOfWork.ExecutionBehavior.NON_INCREMENTAL
        1 * delegate.execute(work, _ as IncrementalChangesContext) >> { UnitOfWork work, IncrementalChangesContext delegateContext ->
            def changes = delegateContext.changes.get()

    }
    /**
     * Register a new item of asynchronous work with the provided build operation.
     *
     * @param operation - The build operation to associate the asynchronous work with
     * @param completion - The completion of the asynchronous work