JS: fix when parenthesized expr has assignments for the same variable…

… which only when interpreted as arguments for an arrow func should error, fixes #528

go.mod

@@ -9,6 +9,6 @@ require (
 	github.com/fsnotify/fsnotify v1.5.4
 	github.com/matryer/try v0.0.0-20161228173917-9ac251b645a2
 	github.com/spf13/pflag v1.0.5
-	github.com/tdewolff/parse/v2 v2.6.2
+	github.com/tdewolff/parse/v2 v2.6.3
 	github.com/tdewolff/test v1.0.7
 )

go.sum

@@ -12,6 +12,8 @@ github.com/spf13/pflag v1.0.5 h1:iy+VFUOCP1a+8yFto/drg2CJ5u0yRoB7fZw3DKv/JXA=
 github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
 github.com/tdewolff/parse/v2 v2.6.2 h1:RDExtQ7ThRGSucatK0nri3p+HD/tSreYh1IDtDDAS/I=
 github.com/tdewolff/parse/v2 v2.6.2/go.mod h1:woz0cgbLwFdtbjJu8PIKxhW05KplTFQkOdX78o+Jgrs=
+github.com/tdewolff/parse/v2 v2.6.3 h1:O5rshbkaRmpRtD7k2lG65bEJpcfUMNg5Cx2uRKWVsI8=
+github.com/tdewolff/parse/v2 v2.6.3/go.mod h1:woz0cgbLwFdtbjJu8PIKxhW05KplTFQkOdX78o+Jgrs=
 github.com/tdewolff/test v1.0.7 h1:8Vs0142DmPFW/bQeHRP3MV19m1gvndjUb1sn8yy74LM=
 github.com/tdewolff/test v1.0.7/go.mod h1:6DAvZliBAAnD7rhVgwaM7DE5/d9NMOAJ09SqYqeK4QE=
 golang.org/x/sys v0.0.0-20220412211240-33da011f77ad h1:ntjMns5wyP/fN65tdBD4g8J5w8n015+iIIs9rtjXkY0=

js/js_test.go

@@ -309,8 +309,6 @@ func TestJS(t *testing.T) {
 		{`for(var a=5,c=6;;);`, `for(var a=5,c=6;;);`},
 		{`while(a);var b;var c`, `for(var b,c;a;);`},
 		{`while(a){d()}var b;var c`, `for(var b,c;a;)d()`},
-		{`function a(){}var a`, `function a(){}var a`},
-		{`var a;function a(){}`, `var a;function a(){}`},
 		{`var [a,b=5,,...c]=[d,e,...f];var z;z`, `var[a,b=5,,...c]=[d,e,...f],z;z`},
 		{`var {a,b=5,[5+8]:c,...d}={d,e,...f};var z;z`, `var{a,b=5,[5+8]:c,...d}={d,e,...f},z;z`},
 		{`var a=5;var b=6;a,b`, `var a=5,b=6;a,b`},
@@ -792,7 +790,8 @@ func TestJS(t *testing.T) {
 		{`var a=5;({});var b=function(){3}`, `var b,a=5;({},b=function(){3})`},                                                                             // #494
 		{`var a=5;({});var b=class{c(){3}}`, `var b,a=5;({},b=class{c(){3}})`},                                                                             // #494
 		{`({});a={b(){3}}`, `({},a={b(){3}})`},                                                                                                             // #494
-		{`export default function Foo(){a}Foo.prototype.bar=b`, `export default function Foo(){a}Foo.prototype.bar=b;Foo=6`},                               // #525
+		{`export default function Foo(){a}Foo.prototype.bar=b`, `export default function Foo(){a}Foo.prototype.bar=b`},                                     // #525
+		{`(e=1,e=2)`, `e=1,e=2`}, // #528
 	}
 
 	m := minify.New()