diff options
Diffstat (limited to 'compiler/src/dotty/tools/dotc/transform/IsInstanceOfEvaluator.scala')
-rw-r--r-- | compiler/src/dotty/tools/dotc/transform/IsInstanceOfEvaluator.scala | 52 |
1 files changed, 26 insertions, 26 deletions
diff --git a/compiler/src/dotty/tools/dotc/transform/IsInstanceOfEvaluator.scala b/compiler/src/dotty/tools/dotc/transform/IsInstanceOfEvaluator.scala index e6b1f5aac..0c6ee7a18 100644 --- a/compiler/src/dotty/tools/dotc/transform/IsInstanceOfEvaluator.scala +++ b/compiler/src/dotty/tools/dotc/transform/IsInstanceOfEvaluator.scala @@ -8,27 +8,27 @@ import Contexts.Context, Types._, Constants._, Decorators._, Symbols._ import TypeUtils._, TypeErasure._, Flags._ /** Implements partial evaluation of `sc.isInstanceOf[Sel]` according to: - * - * | Sel\sc | trait | class | final class | - * | ----------: | :------------------------: | :------------------------: | :--------------: | - * | trait | ? | ? | statically known | - * | class | ? | false if classes unrelated | statically known | - * | final class | false if classes unrelated | false if classes unrelated | statically known | - * - * This is a generalized solution to raising an error on unreachable match - * cases and warnings on other statically known results of `isInstanceOf`. - * - * Steps taken: - * - * 1. `evalTypeApply` will establish the matrix and choose the appropriate - * handling for the case: - * - Sel/sc is a value class or scrutinee is `Any` - * - `handleStaticallyKnown` - * - `falseIfUnrelated` with `scrutinee <:< selector` - * - `handleFalseUnrelated` - * - leave as is (`happens`) - * 2. Rewrite according to steps taken in 1 - */ + * + * | Sel\sc | trait | class | final class | + * | ----------: | :------------------------: | :------------------------: | :--------------: | + * | trait | ? | ? | statically known | + * | class | ? | false if classes unrelated | statically known | + * | final class | false if classes unrelated | false if classes unrelated | statically known | + * + * This is a generalized solution to raising an error on unreachable match + * cases and warnings on other statically known results of `isInstanceOf`. + * + * Steps taken: + * + * 1. `evalTypeApply` will establish the matrix and choose the appropriate + * handling for the case: + * - Sel/sc is a value class or scrutinee is `Any` + * - `handleStaticallyKnown` + * - `falseIfUnrelated` with `scrutinee <:< selector` + * - `handleFalseUnrelated` + * - leave as is (`happens`) + * 2. Rewrite according to steps taken in 1 + */ class IsInstanceOfEvaluator extends MiniPhaseTransform { thisTransformer => import dotty.tools.dotc.ast.tpd._ @@ -37,15 +37,15 @@ class IsInstanceOfEvaluator extends MiniPhaseTransform { thisTransformer => val phaseName = "isInstanceOfEvaluator" /** Transforms a [TypeApply](dotty.tools.dotc.ast.Trees.TypeApply) in order to - * evaluate an `isInstanceOf` check according to the rules defined above. - */ + * evaluate an `isInstanceOf` check according to the rules defined above. + */ override def transformTypeApply(tree: TypeApply)(implicit ctx: Context, info: TransformerInfo): Tree = { val defn = ctx.definitions /** Handles the four cases of statically known `isInstanceOf`s and gives - * the correct warnings, or an error if statically known to be false in - * match - */ + * the correct warnings, or an error if statically known to be false in + * match + */ def handleStaticallyKnown(select: Select, scrutinee: Type, selector: Type, inMatch: Boolean, pos: Position): Tree = { val scrutineeSubSelector = scrutinee <:< selector if (!scrutineeSubSelector && inMatch) { |