Summary: Inaccurate!(numeric)(numeric) error
           Product: D
           Version: 2.031
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Phobos

The errors raised by the numeric-numeric conversion function in std.conv are
inaccurate in two ways:

1. Both underflowing and overflowing conversions raise a
ConversionOverflowError, with the following respective messages presented to
the user:
    std.conv.ConvOverflowError: Error: overflow Conversion underflow
    std.conv.ConvOverflowError: Error: overflow Conversion overflow

2. Converting a floating-point NaN to an integer type gives an underflow error.

Suggestions for simple fixes:
1. At the very least, the "overflow" string which is added to both over- and
underflow errors should be removed from ConvOverflowError.

2. Put the following at the top of the "to" function definition:

    static if (isFloatingPoint!S && !isFloatingPoint!T)
        if (isNaN(value)) ConvOverflowError.raise("Cannot convert "
            ~S.stringof~".nan to "~T.stringof);

(Of course, it is arguable whether the slightly more accurate error message is
worth the performance penalty of the additional check...)

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