Tests for v1 closed generics/static issues (nim-lang#8572)

* Add tests to confirm nim-lang#7231 is fixed.

* Add test for closed nim-lang#6137

* Add test for nim-lang#7141

tests/generics/t6137.nim

@@ -0,0 +1,29 @@
+discard """
+  action: "reject"
+  line: 29
+  errormsg: "\'vectFunc\' doesn't have a concrete type, due to unspecified generic parameters."
+"""
+
+type
+  # simple vector of declared fixed length
+  vector[N : static[int]] = array[0..N-1, float]
+
+proc `*`[T](x: float, a: vector[T]): vector[T] =
+  # multiplication by scalar
+  for ii in 0..high(a):
+    result[ii] = a[ii]*x
+
+let
+  # define a vector of length 3
+  x: vector[3] = [1.0, 3.0, 5.0]
+
+proc vectFunc[T](x: vector[T]): vector[T] {.procvar.} =
+  # Define a vector function
+  result = 2.0*x
+
+proc passVectFunction[T](g: proc(x: vector[T]): vector[T], x: vector[T]): vector[T] =
+  # pass a vector function as input in another procedure
+  result = g(x)
+
+let
+  xNew = passVectFunction(vectFunc,x)

tests/generics/t7141.nim

@@ -0,0 +1,10 @@
+discard """
+  action: "reject"
+  line: 7
+  errormsg: "cannot instantiate: \'T\'"
+"""
+
+proc foo[T](x: T) =
+  discard
+
+var fun = if true: foo else: foo

tests/metatype/ttypeselectors.nim

@@ -99,3 +99,15 @@ echo sizeof(a)
 echo sizeof(b)
 echo sizeof(c)
 
+# This is the same example but using a proc instead of a macro
+# Instead of type mismatch for macro, proc just failed with internal error: getTypeDescAux(tyNone)
+# https://github.com/nim-lang/Nim/issues/7231
+
+proc getBase2*(bits: static[int]): typedesc =
+  if bits == 128:
+    result = newTree(nnkBracketExpr, ident("MpUintBase"), ident("uint64"))
+  else:
+    result = newTree(nnkBracketExpr, ident("MpUintBase"), ident("uint32"))
+
+type
+  MpUint2*[bits: static[int]] = getbase2(bits)