Allow nested digit fields in subfield expressions

Workaround for #470. This allows parsing DoubleLits in subfield
expressions.

1 files changed, 13 insertions, 0 deletions

diff --git a/src/test/scala/firrtlTests/ParserSpec.scala b/src/test/scala/firrtlTests/ParserSpec.scala
index a1f14c8e..cd9bfb40 100644
--- a/src/test/scala/firrtlTests/ParserSpec.scala
+++ b/src/test/scala/firrtlTests/ParserSpec.scala
@@ -93,6 +93,19 @@ class ParserSpec extends FirrtlFlatSpec {
     }
   }
 
+  // ********** Digits as Fields **********
+  "Digits" should "be legal fields in bundles and in subexpressions" in {
+    val input = """
+      |circuit Test :
+      |  module Test :
+      |    input in : { 0 : { 0 : UInt<32>, flip 1 : UInt<32> } }
+      |    input in2 : { 4 : { 23 : { foo : UInt<32>, bar : { flip 123 : UInt<32> } } } }
+      |    in.0.1 <= in.0.0
+      |    in2.4.23.bar.123 <= in2.4.23.foo
+      """.stripMargin
+    firrtl.Parser.parse(input split "\n")
+  }
+
   // ********** Doubles as parameters **********
   "Doubles" should "be legal parameters for extmodules" in {
     val nums = Seq("1.0", "7.6", "3.00004", "1.0E10", "1.0023E-17")