Support inline tag in Header function

Author: jszwec

csvutil.go

@@ -185,7 +185,7 @@ func Header(v interface{}, tag string) ([]string, error) {
 	fields := cachedFields(typeKey{tag, typ})
 	h := make([]string, len(fields))
 	for i, f := range fields {
-		h[i] = f.tag.name
+		h[i] = f.name
 	}
 	return h, nil
 }

csvutil_test.go

@@ -661,6 +661,36 @@ func TestHeader(t *testing.T) {
 			tag:    "csv",
 			header: []string{"Y"},
 		},
+		{
+			desc: "inline - simple",
+			v:    &Inline{},
+			tag:  "csv",
+			header: []string{
+				"int",
+				"Bool",
+				"Uint8",
+				"float",
+				"prefix-STR",
+				"prefix-int",
+				"prefix-Bool",
+				"prefix-Uint8",
+				"prefix-float",
+				"top-string",
+				"STR",
+			},
+		},
+		{
+			desc:   "inline - chain",
+			v:      &Inline5{},
+			tag:    "csv",
+			header: []string{"AS", "AAA", "S", "A"},
+		},
+		{
+			desc:   "inline - top level",
+			v:      &Inline8{},
+			tag:    "csv",
+			header: []string{"AA"},
+		},
 		{
 			desc: "nil ptr of TypeF",
 			v:    nilPtr,