Bundles with structurally typed fields in compatibility mode fail in Scala 2.12

Update (2019): this will continue to be an issue as structural types are going away in Scala 2.13/14+ and Scala 3.

Compiled with Scala 2.12, the following code:

    import Chisel._
    val myReset = true.B
    class ModuleExplicitReset(reset: Bool) extends Module(_reset = reset) {
      val io = new Bundle {
        val done = Bool(OUTPUT)
      }
      io.done := false.B
    }

produces

Error:(14, 10) value done is not a member of Chisel.Bundle
      io.done := false.B

Wrapping the io definition in IO() or extending chisel3.core.UserModule instead of chisel3.core.LegacyModuleeliminates the error. It seems to be a property of the LegacyModule definition.

[azidar]

This will be fixed in 3.5.0 once we delete val io.

[ucbjrl]

We mention this in the release notes.

On Fri, Sep 22, 2017 at 3:31 PM, Jack Koenig [e-mail] wrote:

I think given that it’s solved by IO(…) this issue is closed from our perspective.

To reiterate for posterity: Users of the compatibility wrapper should add the scalac option -Xsource:2.11

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