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Error in /Users/andy/projects/consider_crystal/macro.cr:6: expanding macro

  JSON.mapping(
       ^~~~~~~

in /Users/andy/projects/consider_crystal/macro.cr:6: expanding macro

  JSON.mapping(
  ^

in macro 'mapping' /usr/local/Cellar/crystal-lang/0.24.1_2/src/json/mapping.cr:219, line 1:

>  1.     ::JSON.mapping({lat: Float64, lng: Float642})
   2.   

expanding macro
in macro 'mapping' /usr/local/Cellar/crystal-lang/0.24.1_2/src/json/mapping.cr:219, line 1:

>  1.     ::JSON.mapping({lat: Float64, lng: Float642})
   2.   

expanding macro
in macro 'mapping' /usr/local/Cellar/crystal-lang/0.24.1_2/src/json/mapping.cr:63, line 24:

   1.     
   2.       
   3.     
   4.       
   5.     
   6. 
   7.     
   8.       @lat : Float64 
   9. 
  10.       
  11.         def lat=(_lat : Float64 )
  12.           @lat = _lat
  13.         end
  14.       
  15. 
  16.       
  17.         def lat
  18.           @lat
  19.         end
  20.       
  21. 
  22.       
  23.     
> 24.       @lng : Float642 
  25. 
  26.       
  27.         def lng=(_lng : Float642 )
  28.           @lng = _lng
  29.         end
  30.       
  31. 
  32.       
  33.         def lng
  34.           @lng
  35.         end
  36.       
  37. 
  38.       
  39.     
  40. 
  41.     def initialize(__temp_23 : ::JSON::PullParser)
  42.       
  43.         __temp_24 = nil
  44.         __temp_25 = false
  45.       
  46.         __temp_26 = nil
  47.         __temp_27 = false
  48.       
  49. 
  50.       __temp_28 = __temp_23.location
  51.       __temp_23.read_begin_object
  52.       while __temp_23.kind != :end_object
  53.         __temp_29 = __temp_23.location
  54.         key = __temp_23.read_object_key
  55.         case key
  56.         
  57.           when "lat"
  58.             __temp_25 = true
  59. 
  60.             __temp_24 =
  61.               
  62. 
  63.               
  64. 
  65.               
  66.                 Float64.new(__temp_23)
  67.               
  68. 
  69.               
  70. 
  71.             
  72. 
  73.         
  74.           when "lng"
  75.             __temp_27 = true
  76. 
  77.             __temp_26 =
  78.               
  79. 
  80.               
  81. 
  82.               
  83.                 Float642.new(__temp_23)
  84.               
  85. 
  86.               
  87. 
  88.             
  89. 
  90.         
  91.         else
  92.           
  93.             __temp_23.skip
  94.           
  95.         end
  96.       end
  97.       __temp_23.read_next
  98. 
  99.       
 100.         
 101.           if __temp_24.nil? && !__temp_25 && !::Union(Float64).nilable?
 102.             raise ::JSON::ParseException.new("Missing json attribute: lat", *__temp_28)
 103.           end
 104.         
 105.       
 106.         
 107.           if __temp_26.nil? && !__temp_27 && !::Union(Float642).nilable?
 108.             raise ::JSON::ParseException.new("Missing json attribute: lng", *__temp_28)
 109.           end
 110.         
 111.       
 112. 
 113.       
 114.         
 115.           @lat = (__temp_24).as(Float64)
 116.         
 117.       
 118.         
 119.           @lng = (__temp_26).as(Float642)
 120.         
 121.       
 122. 
 123.       
 124.         
 125.       
 126.         
 127.       
 128.     end
 129. 
 130.     def to_json(json : ::JSON::Builder)
 131.       json.object do
 132.         
 133.           _lat = @lat
 134. 
 135.           
 136.             unless _lat.nil?
 137.           
 138. 
 139.             json.field("lat") do
 140.               
 141. 
 142.               
 143.                 _lat.to_json(json)
 144.               
 145. 
 146.               
 147.             end
 148. 
 149.           
 150.             end
 151.           
 152.         
 153.           _lng = @lng
 154. 
 155.           
 156.             unless _lng.nil?
 157.           
 158. 
 159.             json.field("lng") do
 160.               
 161. 
 162.               
 163.                 _lng.to_json(json)
 164.               
 165. 
 166.               
 167.             end
 168. 
 169.           
 170.             end
 171.           
 172.         
 173.       end
 174.     end
 175.   

undefined constant Float642 (did you mean 'Float64')