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Add support for negative numeric literal types #6511

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Merged
merged 1 commit into from
May 15, 2019
Merged

Add support for negative numeric literal types #6511

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5 changes: 5 additions & 0 deletions compiler/src/dotty/tools/dotc/parsing/Parsers.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -1037,6 +1037,11 @@ object Parsers {
else if (in.token == LBRACE)
atSpan(in.offset) { RefinedTypeTree(EmptyTree, refinement()) }
else if (isSimpleLiteral) { SingletonTypeTree(literal()) }
else if (isIdent(nme.raw.MINUS) && in.lookaheadIn(numericLitTokens)) {
val start = in.offset
in.nextToken()
SingletonTypeTree(literal(negOffset = start))
}
else if (in.token == USCORE) {
val start = in.skipToken()
typeBounds().withSpan(Span(start, in.lastOffset, start))
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9 changes: 9 additions & 0 deletions tests/pos/sip23-negative-literals.scala
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@@ -0,0 +1,9 @@
object Test {
type ~~[A, B]
type nonNeg = 2 ~~ 2

type neg0 = -2
type neg1 = -2 ~~ 2
type neg2 = 2 ~~ -2
type neg3 = -2 ~~ -2
}