1 files changed, 40 insertions, 0 deletions
diff --git a/tests/int/tunsignedinc.nim b/tests/int/tunsignedinc.nim
new file mode 100644
index 000000000..9392f1b74
--- /dev/null
+++ b/tests/int/tunsignedinc.nim
@@ -0,0 +1,40 @@
+
+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