Should map literal support variable reference as key?

[Thihup]

Currently, the spec only shows examples of the map literals using Strings:

2.2.3. Map Construction
Construct an instance of java.util.Map<Object,Object>.

2.2.3.1. Syntax
Map := '{' MapEntries '}'

MapEntries := (MapEntry (',' MapEntry)* )?

MapEntry := expression ':' expression

2.2.3.2. Example
{"one":1, "two":2, "three":3}

However, the MapEntry shows that the key is an expression, so it could mean that a variable could be used as a key. Is that right?

[markt-asf]

Correct. An expression can be used for the key and/or the value when defining a Map.