Merge pull request #14499 from tgodzik/fix-11919

Set zero span for synthetic tuple type

Author: tgodzik

compiler/src/dotty/tools/dotc/ast/Desugar.scala

@@ -1158,7 +1158,7 @@ object desugar {
             mods & Lazy | Synthetic | (if (ctx.owner.isClass) PrivateLocal else EmptyFlags)
           val firstDef =
             ValDef(tmpName, TypeTree(), matchExpr)
-              .withSpan(pat.span.union(rhs.span)).withMods(patMods)
+              .withSpan(pat.span.startPos).withMods(patMods)
           val useSelectors = vars.length <= 22
           def selector(n: Int) =
             if useSelectors then Select(Ident(tmpName), nme.selectorName(n))

language-server/test/dotty/tools/languageserver/HoverTest.scala

@@ -231,4 +231,10 @@ class HoverTest {
            |""".withSource
       .hover(m1 to m2, hoverContent("example.TestEnum3"))
   }
+  
+  @Test def tuple: Unit = {
+    code"""|object A:
+           |  val (${m1}first${m2}, second) = (1, 2)""".withSource
+      .hover(m1 to m2, hoverContent("Int"))
+  }
 }