fix: apply custom parser to pointer-to-custom-type fields

env.go

@@ -380,7 +380,12 @@ func doParseField(
 		return nil
 	}
 	if refField.Kind() == reflect.Ptr && refField.Elem().Kind() == reflect.Struct && !refField.IsNil() {
-		return parseInternal(refField.Interface(), processField, optionsWithEnvPrefix(refTypeField, opts))
+		// If the field has its own env tag, don't recurse into the struct.
+		// Let it fall through to setField, which handles custom parsers.
+		ownKey, _ := parseKeyForOption(refTypeField.Tag.Get(opts.TagName))
+		if ownKey == "" && !opts.UseFieldNameByDefault {
+			return parseInternal(refField.Interface(), processField, optionsWithEnvPrefix(refTypeField, opts))
+		}
 	}
 	if refField.Kind() == reflect.Struct && refField.CanAddr() && refField.Type().Name() == "" {
 		return parseInternal(refField.Addr().Interface(), processField, optionsWithEnvPrefix(refTypeField, opts))

env_test.go

@@ -2417,3 +2417,34 @@ func TestEnvBleed(t *testing.T) {
 		isEqual(t, "", cfg.Foo)
 	})
 }
+
+func TestCustomParserPointerToCustomType(t *testing.T) {
+	// Regression test for #385
+	type foo struct {
+		name string
+	}
+
+	t.Setenv("VAR_CUSTOM", "test")
+	t.Setenv("BLAH_CUSTOM", "test3")
+
+	type config struct {
+		Var foo  `env:"VAR_CUSTOM"`
+		Foo *foo `env:"BLAH_CUSTOM"`
+	}
+
+	cfg := &config{
+		Var: foo{"var"},
+		Foo: &foo{"foo"},
+	}
+
+	err := ParseWithOptions(cfg, Options{FuncMap: map[reflect.Type]ParserFunc{
+		reflect.TypeOf(foo{}): func(v string) (interface{}, error) {
+			return foo{name: v}, nil
+		},
+	}})
+
+	isNoErr(t, err)
+	isEqual(t, "test", cfg.Var.name)
+	isTrue(t, cfg.Foo != nil)
+	isEqual(t, "test3", cfg.Foo.name)
+}