Fix nested pkg member 2 #905
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Compiling scala.math.BigDecimal and scala.math.BigInteger shows a problem.
The conversion `int2bigInt` is not applicable to a Byte because `Byte -> Int`
requires another implicit conversion.
We fix that by using a new method relaxed_<:< for implicit compatibility checks,
which always admits numeric widenings.
This leads to another problem. Now the conversions
implicit def byteToInt(x: Byte): Int
implicit def byteToShort(x: Byte): Short
are ambiguous when we try to convert from Byte to Int.
We fix that by adding a "tie-break" to implicit search
where if several methods match a numeric value result type
and all have numeric value types as result types, we
pick the numerically largest type that matches.
Dotty delivers an ambiguity error. The comment in the test argues why this is OK.
and explain why it's different now.
The previous rules picked the once outer removed member rather than the innermost one, of both members exist. Seen in the wild in scala.sys.ShutdownHookThread. No separate test here, because we'll include large parts of stdlib anyway as a build test.
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/rebuild |
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LGTM (but this should be rebased to not be on top of #902) |
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One more fix to compile stdlib. Review by @smarter.