Question

I am porting a 2.7.7 scala code base over to 2.8 and was wondering if there was a compiler option to display migration notices? I was bitten by a change in behavior for mutable sequences that had the following migration notice[1], however it doesn’t display anything when I build the project ( I have deprecation and unchecked warnings enabled already)

1: @migration(2, 8,
"As of 2.8, this operation creates a new map. To add an element as a\n"+
"side effect to an existing map and return that map itself, use +=."
)

Answer 1

The option is: -Xmigration

Entering scalac -help will show the standard options of the Scala compiler.

Entering scalac -X will show the advanced options.

Entering scalac -Y will show the private options.