Enumerates references to which the message applies.
Values:
UNSPECIFIED (0):
Status doesn't refer to any particular input.
BREAKPOINT_SOURCE_LOCATION (3):
Status applies to the breakpoint and is
related to its location.
BREAKPOINT_CONDITION (4):
Status applies to the breakpoint and is
related to its condition.
BREAKPOINT_EXPRESSION (7):
Status applies to the breakpoint and is
related to its expressions.
BREAKPOINT_AGE (8):
Status applies to the breakpoint and is
related to its age.
VARIABLE_NAME (5):
Status applies to the entire variable.
VARIABLE_VALUE (6):
Status applies to variable value (variable
name is valid).
