1 files changed, 43 insertions, 0 deletions
diff --git a/src/test/scala/chiselTests/ImplicitConversionsSpec.scala b/src/test/scala/chiselTests/ImplicitConversionsSpec.scala
new file mode 100644
index 00000000..d5939b24
--- /dev/null
+++ b/src/test/scala/chiselTests/ImplicitConversionsSpec.scala
@@ -0,0 +1,43 @@
+// See LICENSE for license details.
+
+package chiselTests
+
+import chisel3._
+
+class ImplicitConversionsSpec extends ChiselFlatSpec {
+  ".data on arbitrary Data objects" should "not work" in {
+    assertTypeError("UInt(8.W).data")
+    assertTypeError("8.S.data")
+    assertTypeError("(new Bundle {}).data")
+    assertTypeError("VecInit(1.U).data")
+  }
+
+  ".target on arbitrary Data objects" should "not work" in {
+    assertTypeError("UInt(8.W).target")
+    assertTypeError("8.S.target")
+    assertTypeError("(new Bundle {}).target")
+    assertTypeError("VecInit(1.U).target")
+  }
+
+  ".x on Strings and Numerical values" should "not work" in {
+    assertTypeError("3.x")
+    assertTypeError("3L.x")
+    assertTypeError("BigInt(-4).x")
+    assertTypeError("false.x")
+    assertTypeError(""""a".x""")
+  }
+
+  ".bigint on Strings and Numerical values" should "not work" in {
+    assertTypeError("3.bigint")
+    assertTypeError("3L.bigint")
+    assertTypeError("BigInt(-4).bigint")
+    assertTypeError("false.bigint")
+    assertTypeError(""""a".bigint""")
+  }
+
+  ".target on DecoupledIO" should "not work" in {
+    import chisel3.util._
+    assertTypeError("Decoupled(UInt(8.W)).target")
+  }
+}
+