Compiler raises exception for the specific expression of UInt32 enum value

[lugia-kun]

For the following Crystal source code, the compiler will raise an exception:

module Tests
  enum Test : UInt32
    VAR = (1 << 31)
  end
end

puts Tests::Test::VAR.value

and backtrace is here:

Using compiled compiler at `.build/crystal'
Invalid UInt32: -2147483648 (ArgumentError)
  from crystal/src/string.cr:0:60 in 'to_u32'
  from crystal/src/compiler/crystal/codegen/codegen.cr:432:17 in 'visit'
  from crystal/src/compiler/crystal/syntax/visitor.cr:27:12 in 'accept'
  from crystal/src/compiler/crystal/codegen/codegen.cr:2062:7 in 'accept'
  from crystal/src/compiler/crystal/codegen/const.cr:73:7 in 'initialize_simple_const'
  from crystal/src/compiler/crystal/codegen/codegen.cr:255:11 in 'initialize_simple_class_vars_and_constants'
  from crystal/src/compiler/crystal/codegen/codegen.cr:229:10 in 'initialize'
  from crystal/src/compiler/crystal/codegen/codegen.cr:145:5 in 'new:single_module:debug'
  from crystal/src/compiler/crystal/codegen/codegen.cr:63:7 in 'codegen'
  from crystal/src/compiler/crystal/codegen/codegen.cr:62:5 in 'codegen:debug:single_module'
  from crystal/src/compiler/crystal/compiler.cr:22:7 in 'codegen'
  from crystal/src/compiler/crystal/compiler.cr:153:16 in 'compile'
  from crystal/src/compiler/crystal/command.cr:258:7 in 'compile'
  from crystal/src/compiler/crystal/command.cr:177:14 in 'run_command'
  from crystal/src/compiler/crystal/command.cr:99:7 in 'run'
  from crystal/src/compiler/crystal/command.cr:46:5 in 'run'
  from crystal/src/compiler/crystal/command.cr:45:3 in 'run'
  from crystal/src/compiler/crystal.cr:8:1 in '__crystal_main'
  from crystal/src/crystal/main.cr:97:5 in 'main_user_code'
  from crystal/src/crystal/main.cr:86:7 in 'main'
  from crystal/src/crystal/main.cr:106:3 in 'main'
  from __libc_start_main
  from ../sysdeps/x86_64/start.S:122:0 in '_start'
  from ???
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

It works fine if give the type explicitly, or, without parentheses:

module Tests
  enum Test : UInt32
    VAR = (1_u32 << 31)
  end
end

puts Tests::Test::VAR.value # => 2147483648

module Tests
  enum Test : UInt32
    VAR = 1 << 31
  end
end

puts Tests::Test::VAR.value # => 2147483648

The output of crystal version is here:

> crystal version
Using compiled compiler at `.build/crystal'
Crystal 0.27.1-dev [fcfb8f71d] (2019-01-04)

LLVM: 6.0.1
Default target: x86_64-unknown-linux-gnu

[bcardiff]

Probably related to #7268

[bew]

If we want to fix it one day, I think it can be related to #3803

[RX14]

@bew I don't follow.

[asterite]

This seems to have been fixed by #7776