https://issues.dlang.org/show_bug.cgi?id=22637

          Issue ID: 22637
           Summary: stc.conv `to!double` and `parse!double` dont throw on
                    overflow
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P1
         Component: phobos
          Assignee: nobody@puremagic.com
          Reporter: b2.temp@gmx.com

The documentation says:

""
 * Throws:
 *     A $(LREF ConvException) if `source` is empty, if no number could be
 *     parsed, or if an overflow occurred.
""

The following float literal causes libc strtod to signal overflow inerrno:


"999123254986799969899949354352145897441435999878464164684643513213254364543545634563454199999999999999999999999433212313213119992313453124136468463543543543999999341534654646546464646541341353541999999999965157349999999999320135273486741354354731567431324134999999999999999999999999999999999999999999999135411.9"

But std.conv `to` and `parse` accept it without throwing

---
void main()
{
    import std.conv;

    auto src =
"999123254986799969899949354352145897441435999878464164684643513213254364543545634563454199999999999999999999999433212313213119992313453124136468463543543543999999341534654646546464646541341353541999999999965157349999999999320135273486741354354731567431324134999999999999999999999999999999999999999999999135411.9";
    auto cv1 = parse!double(src);
    auto cv2 =
to!double("999123254986799969899949354352145897441435999878464164684643513213254364543545634563454199999999999999999999999433212313213119992313453124136468463543543543999999341534654646546464646541341353541999999999965157349999999999320135273486741354354731567431324134999999999999999999999999999999999999999999999135411.9");
}
---

--