This phase transforms wildcards in valdefs with their default value.
In particular for every valdef that is declared:
val x : T = _ to
val x : T = <zero of T>
Check what the phase achieves, to be called at any point after it is finished.
A name given to the
Phase that can be used to debug the compiler. For
instance, it is possible to print trees after a given phase using:
$ ./bin/dotc -Xprint:<phaseNameHere> sourceFile.scala