Improve failure diagnostic

odersky · odersky · commit 5c9acb197f71 · 2019-08-12T14:41:46.000+02:00
diff --git a/compiler/src/dotty/tools/backend/sjs/JSCodeGen.scala b/compiler/src/dotty/tools/backend/sjs/JSCodeGen.scala
@@ -404,7 +404,10 @@ class JSCodeGen()(implicit ctx: Context) {
         case EmptyTree  => ()
         case dd: DefDef => generatedMethods ++= genMethod(dd)
         case _ =>
-          throw new FatalError("Illegal tree in gen of genInterface(): " + tree)
+          throw new FatalError(
+            i"""Illegal tree in gen of genInterface(): $tree
+               |class = $td
+               |in ${ctx.compilationUnit}""")
       }
     }
 

Original file line number	Diff line number	Diff line change
`@@ -404,7 +404,10 @@ class JSCodeGen()(implicit ctx: Context) {`
`404`	`404`	`case EmptyTree => ()`
`405`	`405`	`case dd: DefDef => generatedMethods ++= genMethod(dd)`
`406`	`406`	`case _ =>`
`407`		`- throw new FatalError("Illegal tree in gen of genInterface(): " + tree)`
	`407`	`+ throw new FatalError(`
	`408`	`+ i"""Illegal tree in gen of genInterface(): $tree`
	`409`	`+ \|class = $td`
	`410`	`+ \|in ${ctx.compilationUnit}""")`
`408`	`411`	`}`
`409`	`412`	`}`
`410`	`413`