Show equivalent warnings/errors only once (#2673) (#2675)

(cherry picked from commit ae76ff4cb303a6646e48dc044be47051b67e7cbb)

Co-authored-by: Zachary Yedidia <zyedidia@gmail.com>

1 files changed, 35 insertions, 0 deletions

diff --git a/src/test/scala/chiselTests/WarningSpec.scala b/src/test/scala/chiselTests/WarningSpec.scala
new file mode 100644
index 00000000..bf3830d6
--- /dev/null
+++ b/src/test/scala/chiselTests/WarningSpec.scala
@@ -0,0 +1,35 @@
+// SPDX-License-Identifier: Apache-2.0
+
+package chiselTests
+
+import chisel3._
+import chisel3.util._
+import chisel3.stage.{ChiselGeneratorAnnotation, ChiselStage}
+import chisel3.experimental.ChiselEnum
+import chisel3.experimental.EnumType
+import chiselTests.ChiselFlatSpec
+
+class WarningSpec extends ChiselFlatSpec with Utils {
+  behavior.of("Warnings")
+
+  "Warnings" should "be de-duplicated" in {
+    object MyEnum extends ChiselEnum {
+      val e0, e1, e2 = Value
+    }
+
+    class MyModule extends Module {
+      val in = IO(Input(UInt(2.W)))
+      val out1 = IO(Output(MyEnum()))
+      val out2 = IO(Output(MyEnum()))
+      def func(out: EnumType): Unit = {
+        out := MyEnum(in)
+      }
+      func(out1)
+      func(out2)
+    }
+    val (log, _) = grabLog(ChiselStage.elaborate(new MyModule))
+    def countSubstring(s: String, sub: String) =
+      s.sliding(sub.length).count(_ == sub)
+    countSubstring(log, "Casting non-literal UInt") should be(1)
+  }
+}