diff options
Diffstat (limited to 'src/compiler/scala/tools/nsc/typechecker/Typers.scala')
| -rw-r--r-- | src/compiler/scala/tools/nsc/typechecker/Typers.scala | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/src/compiler/scala/tools/nsc/typechecker/Typers.scala b/src/compiler/scala/tools/nsc/typechecker/Typers.scala index a470e80449..ba965290fe 100644 --- a/src/compiler/scala/tools/nsc/typechecker/Typers.scala +++ b/src/compiler/scala/tools/nsc/typechecker/Typers.scala @@ -892,10 +892,16 @@ trait Typers extends Modes { case TypeRef(_, sym, _) => // note: was if (pt.typeSymbol == UnitClass) but this leads to a potentially // infinite expansion if pt is constant type () - if (sym == UnitClass && tree.tpe <:< AnyClass.tpe) // (12) + if (sym == UnitClass && tree.tpe <:< AnyClass.tpe) { // (12) + if (settings.warnValueDiscard.value) + context.unit.warning(tree.pos, "discarded non-Unit value") return typed(atPos(tree.pos)(Block(List(tree), Literal(()))), mode, pt) - else if (isNumericValueClass(sym) && isNumericSubType(tree.tpe, pt)) + } + else if (isNumericValueClass(sym) && isNumericSubType(tree.tpe, pt)) { + if (settings.warnNumericWiden.value) + context.unit.warning(tree.pos, "implicit numeric widening") return typed(atPos(tree.pos)(Select(tree, "to"+sym.name)), mode, pt) + } case AnnotatedType(_, _, _) if canAdaptAnnotations(tree, mode, pt) => // (13) return typed(adaptAnnotations(tree, mode, pt), mode, pt) case _ => @@ -3616,7 +3622,7 @@ trait Typers extends Modes { !(List(Any_isInstanceOf, Any_asInstanceOf) contains result.symbol) // null.is/as is not a dereference } // unit is null here sometimes; how are we to know when unit might be null? (See bug #2467.) - if (settings.Xchecknull.value && isPotentialNullDeference && unit != null) + if (settings.warnSelectNullable.value && isPotentialNullDeference && unit != null) unit.warning(tree.pos, "potential null pointer dereference: "+tree) val selection = result match { |