non_constant_identifier_names   
                  The variable name '{0}' isn't a lowerCamelCase identifier.
Description
#
                    The analyzer produces this diagnostic when the name of a class member,
                    top-level declaration, variable, parameter, named parameter, or named
                    constructor that isn't declared to be const, doesn't use the
                    lowerCamelCase convention.
                  
Example
#
                    The following code produces this diagnostic because the top-level variable
                    Count doesn't start with a lowercase letter:
                  
                      dart
                      
                  var Count = 0;
Common fixes
#Change the name in the declaration to follow the lowerCamelCase convention:
                      dart
                      
                  var count = 0;