crystal-ohm causes "Module validation failed" with --release

[slowernet]

app (master)$ crystal -v
Crystal 0.20.5 (2017-01-20)
app (master)$ crystal build --release src/app.cr 
Module validation failed: inlinable function call in a function with debug info must have a !dbg location
  %0 = call %"WeakRef(Resp)"* @"*WeakRef(Resp)@WeakRef(T)::allocate:WeakRef(Resp)"(i32 1104)

0x101765993: *raise<String>:NoReturn at ??
0x102594d7a: *Crystal::CodeGenVisitor#finish:Nil at ??
0x1024df55d: *Crystal::Compiler#codegen<Crystal::Program, Crystal::ASTNode+, Array(Crystal::Compiler::Source), String>:Nil at ??
0x1017bacb4: *Crystal::Command#run:(Bool | Crystal::Compiler::Result | IO::FileDescriptor | Nil) at ??
0x10178c087: main at ??

Error: you've found a bug in the Crystal compiler. Please open an issue, including source code that will allow us to reproduce the bug: https://github.com/crystal-lang/crystal/issues

app.rb:

require "ohm"

shard.yml:

dependencies:
  ohm:
    github: soveran/ohm-crystal
    branch: master

Thanks.

[slowernet]

Tagging @soveran in case he wants to track.

[soveran]

@slowernet Thanks for adding me. I think it may have to do with some change in 0.20.5, as I had it working with the previous version. I will check the release notes to see if I find something.

[ysbaddaden]

Related to #3890
Some more missing !dbg 😭

In the meantime, you may build/run with --no-debug to avoid the issue, or use a Crystal built with LLVM < 3.9.

[slowernet]

Thanks for the workaround, @ysbaddaden.

[asterite]

Reduced:

class Foo
  def initialize
  end

  def self.allocate
    Pointer(UInt8).malloc(1_u64).as(self)
  end
end

Foo.new