Imports
The syntax of wildcard and renaming imports (and exports) has changed.
Wildcard Imports
Wildcard imports are now expressed with * instead of underscore. Example:
import scala.annotation.* // imports everything in the annotation package
If you want to import a member named * specifically, you can use backticks around it.
object A:
def * = ...
def min = ...
object B:
import A.`*` // imports just `*`
object C:
import A.* // imports everything in A
Renaming Imports
To rename or exclude an import, we now use as instead of =>. A single renaming import no longer needs to be enclosed in braces. Examples:
import A.{min as minimum, `*` as multiply}
import Predef.{augmentString as _, *} // imports everything except augmentString
import scala.annotation as ann
import java as j
Migration
To support cross-building, Scala 3.0 supports the old import syntax with _ for wildcards and => for renamings in addition to the new one. The old syntax will be dropped in a future versions. Automatic rewritings from old to new syntax are offered under settings -source 3.1-migration -rewrite.
Syntax
Import ::= ‘import’ ImportExpr {‘,’ ImportExpr}
ImportExpr ::= SimpleRef {‘.’ id} ‘.’ ImportSpec
| SimpleRef `as` id
ImportSpec ::= NamedSelector
| WildcardSelector
| ‘{’ ImportSelectors) ‘}’
NamedSelector ::= id [‘as’ (id | ‘_’)]
WildCardSelector ::= ‘*' | ‘given’ [InfixType]
ImportSelectors ::= NamedSelector [‘,’ ImportSelectors]
| WildCardSelector {‘,’ WildCardSelector}
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