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block: # bug #2427
var x = 0'u8
dec x # OverflowDefect
x -= 1 # OverflowDefect
x = x - 1 # No error
doAssert(x == 253'u8)
block:
var x = 130'u8
x += 130'u8
doAssert(x == 4'u8)
block:
var x = 40000'u16
x = x + 40000'u16
doAssert(x == 14464'u16)
block:
var x = 4000000000'u32
x = x + 4000000000'u32
doAssert(x == 3705032704'u32)
block:
var x = 123'u16
x -= 125
doAssert(x == 65534'u16)
block t4175:
let i = 0u - 1u
const j = 0u - 1u
doAssert i == j
doAssert j + 1u == 0u
block: # https://forum.nim-lang.org/t/12465#76998
var a: int = 1
var x: uint8 = 1
a.inc(x) # Error: type mismatch
doAssert a == 2
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