More descriptive names of test files (#9531)

* change generic `tissues` name to more specific
* change `tvarious` to more specific names

tests/distinct/tdistinct_issues.nim

@@ -0,0 +1,67 @@
+discard """
+  output: '''
+A
+A
+25.0
+210.0
+apr
+'''
+"""
+
+
+block t4435:
+  type
+    A[T] = distinct T
+    B[T] = distinct T
+
+  proc foo[T](x:A[T]) = echo "A"
+  proc foo[T](x:B[T]) = echo "B"
+  proc bar(x:A) = echo "A"
+  proc bar(x:B) = echo "B"
+
+  var
+    a:A[int]
+
+  foo(a) # fine
+  bar(a) # testdistinct.nim(14, 4) Error: ambiguous call; both testdistinct.bar(x: A) and testdistinct.bar(x: B) match for: (A[system.int])
+
+
+
+block t7010:
+  type MyInt = distinct int
+
+  proc `+`(x: MyInt, y: MyInt): MyInt {.borrow.}
+  proc `+=`(x: var MyInt, y: MyInt) {.borrow.}
+  proc `=`(x: var MyInt, y: MyInt) {.borrow.}
+
+  var next: MyInt
+
+  proc getNext() : MyInt =
+      result = next
+      next += 1.MyInt
+      next = next + 1.MyInt
+
+
+
+block t9079:
+  type
+    Dollars = distinct float
+
+  proc `$`(d: Dollars): string {.borrow.}
+  proc `*`(a, b: Dollars): Dollars {.borrow.}
+  proc `+`(a, b: Dollars): Dollars {.borrow.}
+
+  var a = Dollars(20)
+  a = Dollars(25.0)
+  echo a
+  a = 10.Dollars * (20.Dollars + 1.Dollars)
+  echo a
+
+
+
+block t9322:
+  type Fix = distinct string
+  proc `$`(f: Fix): string {.borrow.}
+  proc mystr(s: string) =
+    echo s
+  mystr($Fix("apr"))