used to determine current function and module
function being called, null if called indirectly
name of function parameter for error messages
VarDeclaration corresponding to par
storage classes of function parameter (may have added scope from pure)
initializer for param
true if the parameter is the msg argument to assert(bool, msg).
do not print error messages
true if pointers to the stack can escape via assignment
Function parameter par is being initialized to arg, and par may escape. Detect if scoped values can escape this way. Print error messages when these are detected.