[do not merge] hack to patch scalajs-ir sources

Author: griggt

project/Build.scala

@@ -702,6 +702,19 @@ object Build {
           IO.createDirectory(trgDir)
           IO.unzip(scalaJSIRSourcesJar, trgDir)
 
+          // TODO hack to patch scalajs-ir to allow compilation with stricter pattern binding rules
+          val fileToPatch = trgDir / "org" / "scalajs" / "ir" / "Trees.scala"
+          val lines = IO.readLines(fileToPatch).map { line =>
+            if (line.endsWith("= propName"))
+              line + ": @unchecked"
+            else
+              line
+          }
+          IO.withTemporaryFile("Trees.scala", "patch") { f =>
+            IO.writeLines(f, lines)
+            IO.copyFile(f, fileToPatch)
+          }
+
           (trgDir ** "*.scala").get.toSet
         } (Set(scalaJSIRSourcesJar)).toSeq
       }.taskValue,