Upgrade assembler to newer Crystal version

shard.yml

@@ -3,7 +3,6 @@ version: 0.1.0
 
 dependencies:
   sdl2:
-    github: ddfreyne/crystal-sdl2
-    branch: crystal-0-15-compat
+    github: weskinner/crystal-sdl2
 
 license: MIT

src/assemble/main.cr

@@ -34,7 +34,7 @@ class RegArg < Arg
 
   getter :name
 
-  def initialize(name)
+  def initialize(name : String)
     @name = name
   end
 
@@ -58,7 +58,7 @@ end
 class ImmArg < Arg
   getter :value
 
-  def initialize(value)
+  def initialize(value : Int32)
     @value = value
   end
 
@@ -88,7 +88,7 @@ end
 class LabelArg < Arg
   getter :name
 
-  def initialize(name)
+  def initialize(name : String)
     @name = name
   end
 
@@ -125,7 +125,7 @@ class Instruction
   getter :opcode_mnemonic
   getter :args
 
-  def initialize(opcode_mnemonic, args)
+  def initialize(opcode_mnemonic : String, args : Array(Arg))
     @opcode_mnemonic = opcode_mnemonic
     @args = args
   end
@@ -150,7 +150,7 @@ end
 class Label
   getter :name
 
-  def initialize(name)
+  def initialize(name : String)
     @name = name
   end
 
@@ -175,7 +175,7 @@ class DataDirective
   getter :length
   getter :arg
 
-  def initialize(length, arg)
+  def initialize(length : Int32, arg : Arg)
     @length = length
     @arg = arg
   end
@@ -236,7 +236,7 @@ end
 class Lexer
   getter tokens
 
-  def initialize(@input)
+  def initialize(@input : String)
     @index = 0
     @tokens = [] of Token
     @current_token = Token.new
@@ -404,7 +404,7 @@ end
 class Parser
   getter statements
 
-  def initialize(@input)
+  def initialize(@input : Array(Token))
     @index = 0
     @statements = [] of Instruction | Label | DataDirective
   end
@@ -599,7 +599,7 @@ end
 ################################################################################
 
 class Assembler
-  def initialize(@input)
+  def initialize(@input : String)
   end
 
   def assemble
@@ -647,7 +647,7 @@ class Assembler
     getter :opcode
     getter :args
 
-    def initialize(opcode : UInt8, args)
+    def initialize(opcode : UInt8, args : Array(Symbol))
       @opcode = opcode
       @args   = args
     end

src/emulate/cpu.cr

@@ -65,7 +65,7 @@ class CPU
   class InvalidOpcodeException < Exception
   end
 
-  def initialize(mem)
+  def initialize(mem : Mem)
     @reg = Reg.new
     @mem = mem
     @running = true

src/emulate/video.cr

@@ -10,7 +10,7 @@ end
 class Graphics
   property render
 
-  def initialize(title, width, height)
+  def initialize(title : String, width : Int32, height : Int32)
     @render_changed = false
 
     # Create window
@@ -96,7 +96,7 @@ RED    = 0xFF4B59F2_u32
 class Video
   PADDING = 16
 
-  def initialize(mem)
+  def initialize(mem : Mem)
     @mem = mem
   end