cascade tyFromExpr in type conversions in generic bodies (#22499)

fixes #22490, fixes #22491, adapts #22029 to type conversions

(cherry picked from commit 98c39e8)

compiler/semexprs.nim

@@ -311,7 +311,7 @@ proc isOwnedSym(c: PContext; n: PNode): bool =
   let s = qualifiedLookUp(c, n, {})
   result = s != nil and sfSystemModule in s.owner.flags and s.name.s == "owned"
 
-proc semConv(c: PContext, n: PNode; expectedType: PType = nil): PNode =
+proc semConv(c: PContext, n: PNode; flags: TExprFlags = {}, expectedType: PType = nil): PNode =
   if n.len != 2:
     localError(c.config, n.info, "a type conversion takes exactly one argument")
     return n
@@ -358,7 +358,7 @@ proc semConv(c: PContext, n: PNode; expectedType: PType = nil): PNode =
   if n[1].kind == nkExprEqExpr and
       targetType.skipTypes(abstractPtrs).kind == tyObject:
     localError(c.config, n.info, "object construction uses ':', not '='")
-  var op = semExprWithType(c, n[1])
+  var op = semExprWithType(c, n[1], flags * {efDetermineType})
   if op.kind == nkClosedSymChoice and op.len > 0 and
       op[0].sym.kind == skEnumField: # resolves overloadedable enums
     op = ambiguousSymChoice(c, n, op)
@@ -373,7 +373,9 @@ proc semConv(c: PContext, n: PNode; expectedType: PType = nil): PNode =
   # here or needs to be overwritten too then.
   result.add op
 
-  if targetType.kind == tyGenericParam:
+  if targetType.kind == tyGenericParam or
+      (op.typ != nil and op.typ.kind == tyFromExpr and c.inGenericContext > 0):
+    # expression is compiled early in a generic body
     result.typ = makeTypeFromExpr(c, copyTree(result))
     return result
 
@@ -1068,7 +1070,7 @@ proc semIndirectOp(c: PContext, n: PNode, flags: TExprFlags; expectedType: PType
     t = skipTypes(n[0].typ, abstractInst+{tyOwned}-{tyTypeDesc, tyDistinct})
   if t != nil and t.kind == tyTypeDesc:
     if n.len == 1: return semObjConstr(c, n, flags, expectedType)
-    return semConv(c, n)
+    return semConv(c, n, flags)
 
   let nOrig = n.copyTree
   semOpAux(c, n)
@@ -3110,7 +3112,7 @@ proc semExpr(c: PContext, n: PNode, flags: TExprFlags = {}, expectedType: PType
         # XXX think about this more (``set`` procs)
         let ambig = c.isAmbiguous
         if not (n[0].kind in {nkClosedSymChoice, nkOpenSymChoice, nkIdent} and ambig) and n.len == 2:
-          result = semConv(c, n, expectedType)
+          result = semConv(c, n, flags, expectedType)
         elif ambig and n.len == 1:
           errorUseQualifier(c, n.info, s)
         elif n.len == 1:

tests/statictypes/tgenericcomputedrange.nim

@@ -115,3 +115,11 @@ block: # issue #22187
     k: array[p(m(T, s)), int64]
   var x: F[int, 3]
   doAssert x.k is array[3, int64]
+
+block: # issue #22490
+  proc log2trunc(x: uint64): int =
+    if x == 0: int(0) else: int(0)
+  template maxChunkIdx(T: typedesc): int64 = 0'i64
+  template layer(vIdx: int64): int = log2trunc(0'u64)
+  type HashList[T] = object
+    indices: array[int(layer(maxChunkIdx(T))), int]