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fix(#18265): crash on extension method without type nor RHS #18743

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Merged
merged 2 commits into from
Feb 1, 2024
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fix(#18265): crash on extension method without type nor RHS #18743

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caf30e3
fix(#18265): crash on extension method without body
i10416 Oct 22, 2023
07761ae
maybefix: update semanticdb expected output
i10416 Oct 22, 2023
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2 changes: 2 additions & 0 deletions compiler/src/dotty/tools/dotc/parsing/Parsers.scala
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Expand Up @@ -2577,6 +2577,8 @@ object Parsers {
parents match {
case parent :: Nil if !in.isNestedStart =>
reposition(if (parent.isType) ensureApplied(wrapNew(parent)) else parent)
case tkn if in.token == INDENT =>
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@i10416 i10416 Oct 22, 2023 •
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With brace syntax, the last token consumed by a parser is }, but with indent syntax, the last token consumed by a parser is OUTDENT, which causes mismatching spans（actual offset is n, but reposition set offset less than n）. Template returned from templateBodyOpt has the exact span, so we reuse it.

New(templateBodyOpt(emptyConstructor, parents, Nil))
case _ =>
New(reposition(templateBodyOpt(emptyConstructor, parents, Nil)))
}
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6 changes: 6 additions & 0 deletions tests/neg/i18265.check
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@@ -0,0 +1,6 @@
-- [E019] Syntax Error: tests/neg/i18265.scala:5:13 --------------------------------------------------------------------
5 | def twice // error
| ^
| Missing return type
|
| longer explanation available when compiling with `-explain`
5 changes: 5 additions & 0 deletions tests/neg/i18265.scala
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@@ -0,0 +1,5 @@
trait Foo

val foo = new Foo:
extension (s: String)
def twice // error