fix: remove import cycles

[n0izn0iz]

• add test in examples/no_cycles_test.go to detect import cycles in stdlibs and examples
• remove import cycles

Depends on #3323

Go never allows import cycles. Our stdlibs have a lot of import cycles, and some examples import self which is not allowed in golang either.
Keeping support for import cycles in stdlib and importing self will require a lot of hacky and weird logic in generic package loading code so I try to tackle this first.

TODO:

• fix tests
• check cycles with the test stdlibs overlay applied

[Gno2D2]

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[codecov]

Codecov Report

Attention: Patch coverage is 76.92308% with 24 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
gnovm/pkg/packages/imports.go	78.04%	8 Missing and 1 partial ⚠️
misc/genstd/genstd.go	33.33%	4 Missing and 2 partials ⚠️
gnovm/pkg/gnomod/pkg.go	66.66%	4 Missing and 1 partial ⚠️
gnovm/stdlibs/testing/testing.go	62.50%	2 Missing and 1 partial ⚠️
gnovm/pkg/doc/dirs.go	66.66%	1 Missing ⚠️

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[thehowl]

these cases should be catchable already by the cyclic-import detector in the store; can you take a look at what's going on there?

[n0izn0iz]

I'm not sure what you mean by the cyclic-import detector in the store, the Store in gnovm/pkg/test/imports.go does not seem to have cycle detection

FYI the self-import in faucet had been there for 2 years

[thehowl]

yeah no apologies I thought about it for two seconds and you're right (because the import will not consider any _test.go files, correctly so)

the store has cyclic import detection, see pkg/gnolang/store.go:

gno/gnovm/pkg/gnolang/store.go

Lines 214 to 225 in 5c31552

	// Gets package from cache, or loads it from baseStore, or gets it from package getter.
	func (ds *defaultStore) GetPackage(pkgPath string, isImport bool) *PackageValue {
	// helper to detect circular imports
	if isImport {
	if slices.Contains(ds.current, pkgPath) {
	panic(fmt.Sprintf("import cycle detected: %q (through %v)", pkgPath, ds.current))
	}
	ds.current = append(ds.current, pkgPath)
	defer func() {
	ds.current = ds.current[:len(ds.current)-1]
	}()
	}

[thehowl]

for stdlibs, instead, i think you could change misc/genstd (note: this binary as well, if it were to stay, would also have to be misc/), by having its import order generator also consider test files

[n0izn0iz]

Indeed, when I cherry-pick c6728c5 on master, I get:

go run github.com/gnolang/gno/misc/genstd
panic: cyclical package initialization on "bytes" (bytes -> io -> bytes)

I like having code that is dedicated to detecting any cycles in stdlibs and examples though, I'll move the nocycles code into a test somewhere I think when I get to the polishing step on this PR

[n0izn0iz]

moved to examples/no_cycles_test.go