Module validation failed: inlinable function call in a function with debug info must have a !dbg location

[carsonbaker]

$ crystal build --release this_borks_compiler.cr
Module validation failed: inlinable function call in a function with debug info must have a !dbg location
  %3 = call i8* @__crystal_malloc_atomic(i32 %2)

0x10d71fb53: *raise<String>:NoReturn at ??
0x10e6f0aab: *Crystal::CodeGenVisitor#finish:Nil at ??
0x10e61c37e: *Crystal::Compiler#codegen<Crystal::Program, Crystal::ASTNode+, Array(Crystal::Compiler::Source), String>:(Tuple(Array(Crystal::Compiler::CompilationUnit), Array(String)) | Nil) at ??
0x10eec1ff4: *Crystal::Compiler#compile<Array(Crystal::Compiler::Source), String>:Crystal::Compiler::Result at ??
0x10d77e1eb: *Crystal::Command#run:(Bool | Crystal::Compiler::Result | IO::FileDescriptor | Nil) at ??
0x10d7498dd: main at ??

crystal -v
Crystal 0.21.1 (2017-03-14) LLVM 4.0.0

Build with
crystal build --release this_borks_compiler.cr

Code that reproduces:
this_borks_compiler.cr.txt

[refi64]

Code in question:

class ModValidationFailedReproduce
  def initialize
    bork_bork_bork = File.size("something")
    Slice(UInt8).new(bork_bork_bork)
  end
end

ModValidationFailedReproduce.new

+1 for bork_bork_bork!

[carsonbaker]

Indeed, just Slice(UInt8).new(File.size("foo")) triggers it.

[carsonbaker]

No errors on a slightly older version of Crystal:

carson$ crystal -v && echo "Slice(UInt8).new(File.size(\".\"))" | crystal eval --release
Crystal 0.21.1 [3c6c75e] (2017-03-06) LLVM 3.5.0
[exits 0]