go build
exec ./main$exe
cmp stderr main.stderr

binsubstr main$exe 'globalVar' # 'globalType' only matches on go < 1.15 
! binsubstr main$exe 'localName' 'globalConst'

garble -debugdir=debug build
exec ./main$exe
cmp stderr main.stderr

! binsubstr main$exe 'localName' 'globalConst' 'globalVar' 'globalType' 'valuable information'

binsubstr debug/main/scopes.go 'localName' 'globalConst'

-- go.mod --
module test/main
-- main.go --
package main

import (
	"encoding/json"
	"go/ast"
)

// This comment contains valuable information. Ensure it's not in the final binary.
var V interface{}

type T struct {
	ast.Node
	*ast.Ident
}

type EncodingT struct {
	Foo int
}

type Embedded int

type Embedding struct {
	Embedded
}

type embedded int

type embedding struct {
	embedded
}

// embedded fields whose type is in the universe scope used to crash garble
type EmbeddingUniverseScope struct {
	error
	int
	string
}

func main() {
	switch V := V.(type) {
	case int:
		var _ int = V
	case nil:
		println("nil case")
	}

	enc, _ := json.Marshal(EncodingT{Foo: 3})
	println(string(enc))
	scopesTest()
}

-- scopes.go --
package main

const globalConst = 1

type globalType int

var (
	globalVar                 = 1
	globalVarTyped globalType = 1
)

func scopesTest() {
	println(globalVar, globalConst, globalVarTyped)
	const localNameConst = 1

	localNameShort := 4

	type localNameType int

	var (
		localNameVar                   = 5
		localNameTypeVar localNameType = 1
	)

	println(localNameConst, localNameShort, localNameVar, localNameTypeVar, input("input"))
}

func input(localNameParam string) (localNameReturn string) { return localNameParam }

-- main.stderr --
nil case
{"Foo":3}
1 1 1
1 4 5 1 input