When using latest nim "[...] util.nim(81, 12) Error: 'nil' is now invalid for 'string';"

[traverseda]

githubcom_zielmichacapnpnim/capnp/util.nim(81, 12) Error: 'nil' is now invalid for 'string';

Nim Compiler Version 1.0.2 [Linux: amd64]

[weskerfoot]

nimble install --passNim:'--nilseqs:on' capnp works for me

[kvelicka]

That unfortunately no longer works either:

$ nimble install --passNim:'--nilseqs:on' capnp
Downloading https://github.com/zielmicha/capnp.nim using git
  Verifying dependencies for capnp@0.0.3
      Info: Dependency on collections@>= 0.1.2 already satisfied
  Verifying dependencies for collections@0.5.2
 Installing capnp@0.0.3
   Building capnp/capnp/capnpc using c backend
       Tip: 3 messages have been suppressed, use --verbose to show them.
     Error: Build failed for package: capnp
        ... Details:
        ... Execution failed with exit code 1
        ... Command: "/home/karl/.nimble/bin/nim" c --noNimblePath -d:NimblePkgVersion=0.0.3 --nilseqs:on -d:release --path:"/home/karl/.nimble/pkgs/collections-0.5.2"  -o:"/tmp/nimble_9650/githubcom_zielmichacapnpnim/capnp/capnpc" "/tmp/nimble_9650/githubcom_zielmichacapnpnim/capnp/capnpc.nim"
        ... Output: Hint: used config file '/home/karl/.choosenim/toolchains/nim-1.2.0/config/nim.cfg' [Conf]
        ... Hint: used config file '/tmp/nimble_9650/githubcom_zielmichacapnpnim/capnp/capnpc.nim.cfg' [Conf]
        ... Hint: system [Processing]
        ... Hint: widestrs [Processing]
        ... Hint: io [Processing]
        ... Hint: capnpc [Processing]
        ... Hint: capnp [Processing]
        ... Hint: endians [Processing]
        ... Hint: strutils [Processing]
        ... Hint: parseutils [Processing]
        ... Hint: math [Processing]
        ... Hint: bitops [Processing]
        ... Hint: macros [Processing]
        ... Hint: algorithm [Processing]
        ... Hint: unicode [Processing]
        ... Hint: sequtils [Processing]
        ... Hint: typetraits [Processing]
        ... Hint: reflect [Processing]
        ... Hint: lang [Processing]
        ... Hint: future [Processing]
        ... Hint: underscored_calls [Processing]
        ... Hint: iface [Processing]
        ... Hint: misc [Processing]
        ... Hint: iterate [Processing]
        ... Hint: options [Processing]
        ... Hint: tables [Processing]
        ... Hint: hashes [Processing]
        ... Hint: macrotool [Processing]
        ... Hint: pprint [Processing]
        ... /tmp/nimble_9650/githubcom_zielmichacapnpnim/capnp/util.nim(4, 26) Warning: inherit from a more precise exception type like ValueError, IOError or OSError [InheritFromException]
        ... /tmp/nimble_9650/githubcom_zielmichacapnpnim/capnp/common.nim(5, 26) Warning: inherit from a more precise exception type like ValueError, IOError or OSError [InheritFromException]
        ... /tmp/nimble_9650/githubcom_zielmichacapnpnim/capnp/common.nim(28, 27) Warning: `typed` will change its meaning in future versions of Nim. `void` or no return type declaration at all has the same meaning as the current meaning of `typed` as return type declaration. [Deprecated]
        ... Hint: collections [Processing]
        ... Hint: bytes [Processing]
        ... Hint: base64 [Processing]
        ... Hint: views [Processing]
        ... /home/karl/.nimble/pkgs/collections-0.5.2/collections/bytes.nim(97, 23) Error: type mismatch: got <string, newline: string>
        ... but expected one of:
        ... proc encode(s: string; safe = false): string
        ...   first type mismatch at position: 2
        ...   unknown named parameter: newline
        ... proc encode[T: SomeInteger | char](s: openArray[T]; safe = false): string
        ...   first type mismatch at position: 2
        ...   unknown named parameter: newline
        ... expression: base64.encode(s, newline = "")

I'm on Ubuntu 18.04 an Nim compiler 1.2.0