Checks if pkg is a sub-package of this
Checks for the existence of a package.d to set isPkgMod appropriately if isPkgMod == PKG.unknown
Input: packages[] the pkg1.pkg2 of pkg1.pkg2.mod
This function is #1 on the list of functions that eat cpu time. Be very, very careful about slowing it down.
Look for member of the form: const(MemberInfo)[] getMembers(string); Returns NULL if not found
Insert Dsymbol in table.
Look up identifier in symbol table.
Return true if any of the members are static ctors or static dtors, or if any members have members that are.
Expands attribute declarations in members in depth first order. Calls dg(size_t symidx, Dsymbol *sym) for each member. If dg returns !=0, stops and returns that value else returns 0. Use this function to avoid the O(N + N^2/2) complexity of calculating dim and calling N times getNth.