Nim/tests/misc/tunsignedconv.nim

# Tests unsigned literals and implicit conversion between uints and ints
# Passes if it compiles

var h8:uint8 = 128
var h16:uint16 = 32768
var h32:uint32 = 2147483648'u32
var h64:uint64 = 9223372036854775808'u64
var foobar:uint64 = 9223372036854775813'u64 # Issue 728

var v8:uint8 = 10
var v16:uint16 = 10
var v32:uint32 = 10
var v64:uint64 = 10

# u8 + literal produces u8:
var a8: uint8 = v8 + 10
var a16: uint16 = v16 + 10

when false:
  var d8  = v8 + 10'i8
  var d16 = v8 + 10'i16
  var d32 = v8 + 10'i32

when false:
  # these dont work yet because unsigned.nim is stupid. XXX We need to fix this.
  var f8  = v16 + 10'u8
  var f16 = v16 + 10'u16
  var f32 = v16 + 10'u32

  var g8  = v32 + 10'u8
  var g16 = v32 + 10'u16
  var g32 = v32 + 10'u32

var ar: array[0..20, int]
var n8 = ar[v8]
var n16 = ar[v16]
var n32 = ar[v32]
var n64 = ar[v64]


block t4176:
  var yyy: uint8 = 0
  yyy = yyy - 127
  doAssert type(yyy) is uint8