Compiler assertion failure for lambdas without explicit type declaration

[ergl]

I got a compiler assertion error from the following code

actor Main
    new create(env: Env) =>
        {(a) => a}

Full backtrace:

Building builtin -> /usr/local/Cellar/ponyc/0.11.2/packages/builtin
Building . -> /Users/ryan/Downloads/test
src/libponyc/pass/scope.c:19: set_scope: Assertion `ast_id(name) == TK_ID` failed.

Backtrace:
  0   ponyc                               0x000000010a1cb837 ponyint_assert_fail + 176
  1   ponyc                               0x000000010a1a8ad3 set_scope + 391
  2   ponyc                               0x000000010a1a8e38 pass_scope + 838
  3   ponyc                               0x000000010a1a80e5 ast_visit + 115
  4   ponyc                               0x000000010a1a8159 ast_visit + 231
  5   ponyc                               0x000000010a1a8159 ast_visit + 231
  6   ponyc                               0x000000010a1a8159 ast_visit + 231
  7   ponyc                               0x000000010a1a8159 ast_visit + 231
  8   ponyc                               0x000000010a1a856b visit_pass + 77
  9   ponyc                               0x000000010a1a8367 ast_passes + 119
  10  ponyc                               0x000000010a1a8702 ast_passes_type + 177
  11  ponyc                               0x000000010a196bee expr_object + 2949
  12  ponyc                               0x000000010a1a5653 pass_expr + 236
  13  ponyc                               0x000000010a1a8193 ast_visit + 289
  14  ponyc                               0x000000010a1a856b visit_pass + 77
  15  ponyc                               0x000000010a1a8492 ast_passes + 418
  16  ponyc                               0x000000010a195f1b expr_lambda + 2401
  17  ponyc                               0x000000010a1a5660 pass_expr + 249
  18  ponyc                               0x000000010a1a8193 ast_visit + 289
  19  ponyc                               0x000000010a1a8159 ast_visit + 231
  20  ponyc                               0x000000010a1a8159 ast_visit + 231
  21  ponyc                               0x000000010a1a8159 ast_visit + 231
  22  ponyc                               0x000000010a1a8159 ast_visit + 231
  23  ponyc                               0x000000010a1a8159 ast_visit + 231
  24  ponyc                               0x000000010a1a8159 ast_visit + 231
  25  ponyc                               0x000000010a1a8159 ast_visit + 231
  26  ponyc                               0x000000010a1a856b visit_pass + 77
  27  ponyc                               0x000000010a1a8492 ast_passes + 418
  28  ponyc                               0x000000010a1b6a8e program_load + 158
  29  ponyc                               0x000000010a145258 compile_package + 24
  30  ponyc                               0x000000010a145133 main + 1187
  31  libdyld.dylib                       0x00007fff92dc95ad start + 1
This is an optimised version of ponyc: the backtrace may be imprecise or incorrect.
Use a debug version to get more meaningful information.
Illegal instruction: 4

Pony compiler version (installed through Homebrew):

> ponyc -v
0.11.2 [release]
compiled with: llvm 3.8.1 -- Apple LLVM version 8.0.0 (clang-800.0.42.1)

Running on El Capitan

[SeanTAllen]

This is a bug that should be caught in the syntax pass for not having a type in the parameter.

[ergl]

This was fixed by #2011 (thanks!), so I'll close this now.