3 files changed, 31 insertions, 0 deletions
diff --git a/tests/js/tneginthash.nim b/tests/js/tneginthash.nim
new file mode 100644
index 000000000..c082405c9
--- /dev/null
+++ b/tests/js/tneginthash.nim
@@ -0,0 +1,21 @@
+# issue #19929
+
+import std/[tables, hashes]
+
+type Foo = object
+  a: int
+
+proc hash(f: Foo): Hash =
+  var h: Hash = 0
+  h = h !& hash(f.a)
+  result = !$h
+
+proc transpose[T, S](data: array[T, S]): Table[S, T] =
+  for i, x in data:
+    result[x] = i
+
+const xs = [Foo(a: 5), Foo(a: -5)]
+const x = transpose(xs)
+
+doAssert x[Foo(a: -5)] == 1
+doAssert x[Foo(a: 5)] == 0
diff --git a/tests/stdlib/thashes.nim b/tests/stdlib/thashes.nim
index 6b5e055b4..b6fbbbdb7 100644
--- a/tests/stdlib/thashes.nim
+++ b/tests/stdlib/thashes.nim
@@ -29,6 +29,9 @@ block hashes:
     const wy123 = hashWangYi1(123)
     doAssert wy123 != 0
     doAssert hashWangYi1(123) == wy123
+    const wyNeg123 = hashWangYi1(-123)
+    doAssert wyNeg123 != 0
+    doAssert hashWangYi1(-123) == wyNeg123
 
 
   # "hashIdentity value incorrect at 456"
diff --git a/tests/vm/ttouintconv.nim b/tests/vm/ttouintconv.nim
index ff2187a36..8c43a3adb 100644
--- a/tests/vm/ttouintconv.nim
+++ b/tests/vm/ttouintconv.nim
@@ -75,3 +75,10 @@ macro foo2() =
 
 foo()
 foo2()
+
+block:
+  const neg5VM = block:
+    let x = -5'i8
+    uint64(x)
+  let y = -5'i8
+  doAssert uint64(y) == neg5VM