Add 1 to be not considered as magic number

README.md

@@ -94,7 +94,7 @@ return 3
 
 ## Excludes
 
-By default the number 0 and test files are excluded! 
+By default the numbers 0 and 1 as well as test files are excluded! 
 
 ### Further known excludes
 

checks/argument.go

@@ -60,7 +60,7 @@ func (a *ArgumentAnalyzer) Check(n ast.Node) {
 				switch expr.Args[i-1].(type) {
 				case *ast.ChanType:
 					// When it's not a simple buffered channel, report it
-					if x.Value != "1" {
+					if a.isMagicNumber(x) {
 						a.pass.Reportf(x.Pos(), reportMsg, x.Value, ArgumentCheck)
 					}
 				}

config/config.go

@@ -18,6 +18,7 @@ func DefaultConfig() *Config {
 		Checks: map[string]bool{},
 		IgnoredNumbers: map[string]struct{}{
 			"0": {},
+			"1": {},
 		},
 		Excludes: []*regexp.Regexp{
 			regexp.MustCompile(`_test.go`),

testdata/src/argument/argument.go

@@ -4,7 +4,9 @@ import (
 	"context"
 	"math"
 	"net/http"
+	"os"
 	"strings"
+	"sync"
 	"time"
 )
 
@@ -54,3 +56,18 @@ func example8() {
 	c := make(chan int, 2) // want "Magic number: 2"
 	c <- 1
 }
+
+func example9() {
+	os.Exit(1)
+}
+
+func example10() {
+	var wg sync.WaitGroup
+	wg.Add(1)
+
+	go func() {
+		duration := 500 * time.Millisecond // want "Magic number: 500"
+		time.Sleep(duration)
+		wg.Done()
+	}()
+}