some test cleanups & category reorganization (#22010)

* clean up some test categories

* mention exact slice issue

* magics into system

* move trangechecks into overflow

* move tmemory to system

* try fix CI

* try fix CI

* final CI fix

tests/constructors/a.nim

@@ -0,0 +1,2 @@
+type A* = object
+  a: uint8

tests/constructors/b.nim

@@ -0,0 +1,2 @@
+type B* = object
+proc A*(a, b: float): B = discard

tests/constructors/t18990.nim

@@ -0,0 +1,3 @@
+import a, b
+discard A(1f, 1f) # works
+proc x(b = A(1f, 1f)) = discard # doesn't work

tests/constructors/tconstr1.nim

@@ -0,0 +1,28 @@
+discard """
+  errormsg: "type mismatch"
+  file: "tconstr1.nim"
+  line: 25
+"""
+# Test array, record constructors
+
+type
+  TComplexRecord = tuple[
+    s: string,
+    x, y: int,
+    z: float,
+    chars: set[char]]
+
+proc testSem =
+  var
+    things: array[0..1, TComplexRecord] = [
+      (s: "hi", x: 69, y: 45, z: 0.0, chars: {'a', 'b', 'c'}),
+      (s: "hi", x: 69, y: 45, z: 1.0, chars: {'a', 'b', 'c'})]
+  write(stdout, things[0].x)
+
+const
+  things: array[0..1, TComplexRecord] = [
+    (s: "hi", x: 69, y: 45, z: 0.0, chars: {'a', 'b', 'c'}),
+    (s: "hi", x: 69, y: 45, z: 1.0)] #ERROR
+  otherThings = [  # the same
+    (s: "hi", x: 69, y: 45, z: 0.0, chars: {'a', 'b', 'c'}),
+    (s: "hi", x: 69, y: 45, z: 1.0, chars: {'a'})]

tests/constructors/tconstr2.nim

@@ -0,0 +1,22 @@
+discard """
+  output: "69"
+"""
+# Test array, record constructors
+
+type
+  TComplexRecord = tuple[
+    s: string,
+    x, y: int,
+    z: float,
+    chars: set[char]]
+
+const
+  things: array[0..1, TComplexRecord] = [
+    (s: "hi", x: 69, y: 45, z: 0.0, chars: {'a', 'b', 'c'}),
+    (s: "hi", x: 69, y: 45, z: 1.0, chars: {})]
+  otherThings = [  # the same
+    (s: "hi", x: 69, y: 45, z: 0.0, chars: {'a', 'b', 'c'}),
+    (s: "hi", x: 69, y: 45, z: 1.0, chars: {'a'})]
+
+writeLine(stdout, things[0].x)
+#OUT 69