Static[T] fixes (#7333)

* fix the usage of unresolved static[T] parameters in proc signatures
* fix tsametype and tmacrogenerics
* Allow creating composite type classes with concepts and using them in type signatures
* Allow integers to be used in ident concatenations
* Support using imported C++ generic types in proc signatures
* fixes #7230
* closes #7379
* re-enable some metatype tests

tests/statictypes/tcryptodigest.nim

@@ -0,0 +1,44 @@
+discard """
+  output: "Digest[128]\nDigest[256]"
+"""
+
+import typetraits
+
+type
+  Digest[bits: static[int]] = object
+    data: array[bits div 8, byte]
+
+  ContextKind = enum
+    A, B, C
+
+  HashingContext[bits: static[int], kind: static[ContextKind]] = object
+    ctx: array[bits div 8, byte]
+
+  Hash128 = HashingContext[128, A]
+  Hash256 = HashingContext[256, B]
+
+  HMAC[HashType] = object
+    h: HashType
+
+proc init(c: var HashingContext) = discard
+proc update(c: var HashingContext, data: ptr byte, dataLen: uint) = discard
+proc finish(c: var HashingContext): Digest[c.bits] = discard
+
+proc digest(T: typedesc, data: ptr byte, dataLen: uint): Digest[T.bits] =
+  mixin init, update, finish
+
+  var ctx: T
+  ctx.init()
+  ctx.update(data, dataLen)
+  result = ctx.finish()
+
+var h = Hash128.digest(nil, 0)
+echo h.type.name
+
+proc finish(hmac: var HMAC): Digest[HMAC.HashType.bits] =
+  discard
+
+var hm: HMAC[Hash256]
+var d = hm.finish
+echo d.type.name
+

tests/statictypes/tstaticimportcpp.nim

@@ -1,9 +1,9 @@
 discard """
 targets: "cpp"
-output: "[0, 0, 10, 0]\n5\n1.2\n15\ntest"
+output: "[0, 0, 10, 0]\n5\n1.2\n15\ntest\n[0, 0, 20, 0]"
 """
 
-{.emit: """
+{.emit: """/*TYPESECTION*/
 
 template <int N, class T>
 struct GenericIntType {
@@ -51,3 +51,9 @@ echo c.field
 echo d.field
 echo e.field
 
+proc plus(a, b: GenInt4): GenInt4 =
+  for i in 0 ..< result.data.len:
+    result.data[i] = a.data[i] + b.data[i]
+
+echo plus(a, a).data
+