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.golangci.next.reference.yml

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It feels like the same thing as#4196

Alsothis code is a problem.

Yeah, looks similar indeed.
There are 2 differences:

1. constructorcheck ignores types from the standard library (there are too many exceptions to the rule there like bytes.Buffer whose zero value is safe to use while there is also bytes.NewBuffer)
2. constructorcheck tells you the name of the constructor to use

1. constructorcheck ignores types from the standard library (there are too many exceptions to the rule there like bytes.Buffer whose zero value is safe to use while there is also bytes.NewBuffer)

This code is a major problem.

constructorcheck tells you the name of the constructor to use

It's a minor difference and I feel this will lead to wrong suggestions when there are several "constructors".

BTW, is there a different way to get the list of standard library packages? This hack with callinggo tool was the only way I could find.

This should never be called at runtime.

It uses a very strict definition of what is a constructor - it's a function NewT, where T is the name of a type, existing in the same package, that returns only one value of the same type T. You can not have two of them in the same package because every function name must be unique within a package. I don't see a potential for a confusion here.

As for the standard library package list - I agree that I need to find a different way to do it.

I don't see a potential for a confusion here.

I can easily see it:

typeFoostruct{}funcNewFoo(astring)*Foo           {returnnil }funcNewFooWithOption(bstring)*Foo {returnnil }

typeBarstruct{}// Deprecated: use NewBarWithOptionfuncNewBar(astring)*Bar           {returnnil }funcNewBarWithOption(bstring)*Bar {returnnil }

What will be the constructor suggested by your linter in those 2 cases?
Your linter will suggestNewFoo andNewBar.

In the first case, no constructors must be suggested.
In the second case, theNewBarWithOption must be suggested.

Like I already said this is a minor difference. But this difference will lead to false positives and this is something we want to avoid inside golangci-lint.

We can also talk about basic package-oriented constructors:

typeFoostruct{}funcNew()*Foo  {returnnil }

It will lead to false negatives.

You're the first person giving me good feedback :)
All valid points. I need to fix them. Should I close this PR until I do it?

... that returns only one value of the same type T

Maybe I misunderstood this part but I'd like to add that it's not uncommon for constructors to be fallible (and if so, sometimes such constructors might have aMust alternative)

typeFoostruct {}funcNewFoo() (*Foo,error) {iferr:=setup();err!=nil {returnnil,err    }return&Foo{},nil}funcMustNewFoo()*Foo {foo,err:=NewFoo()iferr!=nil {panic(err)    }returnfoo}

Yes, also sometimes constructors return something like this:
(T, error)(*T, error),(T, bool)(*T, bool)

But I'm much more worried about being misleading and giving false error messages than missing something. The latter makes the linter not 100% efficient, the former makes it unusable.

This code is a major problem.

Go itself does itall over the place.

I will try to dig how the go tool itself does it and see if it makes sense to copy the implementation from there.

UPD: fortunately it's quite simple:just packages.Load(cfg, "std")