@Markup
	public GoType getKey() throws IOException {
		return programContext.getGoTypes().getType(key);
	}
Returns the GoType that defines the map's key, referenced by the key field's markup annotation

@return GoType that defines the map's key
@throws IOException if error reading data
Ghidra/Features/Base/src/main/java/ghidra/app/util/bin/format/golang/rtti/types/GoMapType.java