Nil assertion failed when defining an array with constans

[Xosmond]

Bug Report

Hello, I was playing with crystal and trying to reproduce arrays with constants like ruby, and I found this bug:

NAMES = [ NAME = "name" ]
puts NAMES.inspect

crystal sample.cr

Nil assertion failed (NilAssertionError)
  from raise<NilAssertionError>:NoReturn
  from Nil#not_nil!:NoReturn
  from Crystal::CleanupTransformer#transform<Crystal::Assign>:Crystal::ASTNode+
  from Crystal::ASTNode+@Crystal::ASTNode#transform<Crystal::CleanupTransformer>:Crystal::ASTNode+
  from Crystal::CleanupTransformer#transform<Crystal::TypeOf>:Crystal::TypeOf
  from Crystal::ASTNode+@Crystal::ASTNode#transform<Crystal::CleanupTransformer>:Crystal::ASTNode+
  from Crystal::ASTNode+@Crystal::ASTNode#transform<Crystal::CleanupTransformer>:Crystal::ASTNode+
  from Crystal::CleanupTransformer#transform<Crystal::Call>:Crystal::ASTNode+
  from Crystal::ASTNode+@Crystal::ASTNode#transform<Crystal::CleanupTransformer>:Crystal::ASTNode+
  from Crystal::CleanupTransformer#transform<Crystal::Assign>:Crystal::ASTNode+
  from Crystal::ASTNode+@Crystal::ASTNode#transform<Crystal::CleanupTransformer>:Crystal::ASTNode+
  from Crystal::CleanupTransformer#transform<Crystal::Expressions>:Crystal::ASTNode+
  from Crystal::ASTNode+@Crystal::ASTNode#transform<Crystal::CleanupTransformer>:Crystal::ASTNode+
  from Crystal::ASTNode+@Crystal::ASTNode#transform<Crystal::CleanupTransformer>:Crystal::ASTNode+
  from Crystal::CleanupTransformer#transform<Crystal::Assign>:Crystal::ASTNode+
  from Crystal::ASTNode+@Crystal::ASTNode#transform<Crystal::CleanupTransformer>:Crystal::ASTNode+
  from Crystal::CleanupTransformer#transform<Crystal::Expressions>:Crystal::ASTNode+
  from Crystal::ASTNode+@Crystal::ASTNode#transform<Crystal::CleanupTransformer>:Crystal::ASTNode+
  from Crystal::Program#visit_main<Crystal::ASTNode+, Crystal::MainVisitor, Bool, Bool>:Crystal::ASTNode+
  from Crystal::Program#semantic<Crystal::ASTNode+, Bool>:Crystal::ASTNode+
  from Crystal::Compiler#compile<Array(Crystal::Compiler::Source), String>:Crystal::Compiler::Result
  from Crystal::Command#run_command<Bool>:Nil
  from Crystal::Command#run:(Bool | Nil)
  from __crystal_main
  from main
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

Crystal version:

Crystal 1.0.0 [dd40a2442] (2021-03-22)

LLVM: 6.0.1
Default target: x86_64-apple-macos

[HertzDevil]

#10281, especially #10281 (comment).

[Xosmond]

Closing, thanks