[Compiler crash] Module validation failed: Invalid bitcast

[TechMagister]

Crystal 0.20.1+39 [a8fbc2d] (2016-12-14) and Crystal 0.20.1 [18e7617] (2016-12-05) ( Same error but without the backtrace )
Compiled with LLVM version 3.8.0
OS: Linux

My code : https://github.com/TechMagister/i18n.cr
It happens when running spec : crystal spec

With Crystal 0.20.1 [18e7617] (2016-12-05)

Module validation failed: Bitcast requires both operands to be pointer or neither
  %5 = bitcast %"(Bool | Int32)" %arg to %"(Bool | Int32 | NamedTuple(iter: Int32, format: Bool) | String)"*, !dbg !42
Bitcast requires both operands to be pointer or neither
  %3 = bitcast %"(Bool | Int32)" %arg to %"(Bool | Int32 | NamedTuple(iter: Int32, format: Bool))"*, !dbg !42
Bitcast requires both operands to be pointer or neither
  %3 = bitcast %"(Bool | Int32)" %arg to %"(Bool | Int32 | NamedTuple(iter: Int32, format: Bool))"*, !dbg !42

0x53beae: ??? at ??
0x11da247: ??? at ??
0x1130f9d: ??? at ??
0x593016: ??? at ??
0x56023b: main at ??
0x7fc048b32401: __libc_start_main at ??
0x53b7e1: ??? 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/issu
es

With Crystal 0.20.1+39 [a8fbc2d] (2016-12-14)

Module validation failed: Invalid bitcast
  %4 = bitcast %"(Bool | Int32)" %arg to %"(Bool | Int32 | NamedTuple(iter: Int32, format: Bool) | String)"*, !dbg !41
Invalid bitcast
  %3 = bitcast %"(Bool | Int32)" %arg to %"(Bool | Int32 | NamedTuple(iter: Int32, format: Bool))"*, !dbg !41
Invalid bitcast
  %2 = bitcast %"(Bool | Int32)" %arg to %"(Bool | Int32 | NamedTuple(iter: Int32, format: Bool))"*, !dbg !41

0x7513a7: *CallStack::unwind:Array(Pointer(Void)) at ??
0x75133a: *CallStack#initialize:Array(Pointer(Void)) at ??
0x75130a: *CallStack::new:CallStack at ??
0x72b51e: *raise<Exception>:NoReturn at ??
0x72b50e: ??? at ??
0x138fdf3: *LLVM::Module#verify:Nil at ??
0x13e3e98: *Crystal::CodeGenVisitor#finish:Hash(String, LLVM::Module) at ??
0x88f061: *Crystal::Program#codegen<Crystal::ASTNode+, (Array(String) | Bool | Nil), Bool, LLVM::Module, Bool>:Hash(String, LLVM::Module) at ??
0x88efae: *Crystal::Program#codegen:debug:single_module:expose_crystal_main<Crystal::ASTNode+, Bool, (Array(String) | Bool | Nil), Bool>:Hash(String, LLVM::Module) at ??
0xfdf43d: *Crystal::Compiler#codegen<Crystal::Program, Crystal::ASTNode+, Array(Crystal::Compiler::Source), String>:(Array(String) | Nil) at ??
0xfdca06: *Crystal::Compiler#compile<Array(Crystal::Compiler::Source), String>:Crystal::Compiler::Result at ??
0x85c1a3: *Crystal::Command#spec:NoReturn at ??
0x8573f4: *Crystal::Command#run:(Array(Crystal::ImplementationTrace) | Array(Crystal::Init::View+:Class) | Array(String) | Bool | Crystal::Compiler::Result | Hash(String, String) |
 IO::FileDescriptor | Nil) at ??
0x856d4b: *Crystal::Command::run<Array(String)>:(Array(Crystal::ImplementationTrace) | Array(Crystal::Init::View+:Class) | Array(String) | Bool | Crystal::Compiler::Result | Hash(S
tring, String) | IO::FileDescriptor | Nil) at ??
0x856d09: *Crystal::Command::run:(Array(Crystal::ImplementationTrace) | Array(Crystal::Init::View+:Class) | Array(String) | Bool | Crystal::Compiler::Result | Hash(String, String)
| IO::FileDescriptor | Nil) at ??
0x72af39: ??? at ??
0x73d489: main at ??
0x7f5c24175401: __libc_start_main at ??
0x72a0ba: _start at ??
0x0: ??? 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/issu
es

[asterite]

I'll take a look at this soon, but I see this often enough so I'll say it: don't use **options and then options[:throw] and such. This makes your code very hard to read, write and follow. You should use named arguments. So:

def method(throw = :throw, force_locale = config.locale.to_s)
  # Nothing to do here :-)
end

# Instead of the much more verbose
def method(**options)
  throw = options[:throw]? || :throw
  locale = options[:force_locale]? || config.locale.to_s
end

[asterite]

Reduced:

def foo(arg)
  arg = ""
end

foo(1 || true)