2 files changed, 25 insertions, 0 deletions
diff --git a/compiler/semexprs.nim b/compiler/semexprs.nim
index 0f6422887..fc2d9debc 100644
--- a/compiler/semexprs.nim
+++ b/compiler/semexprs.nim
@@ -198,6 +198,8 @@ proc semConv(c: PContext, n: PNode): PNode =
       # separate proc from fitNode?
       if op.kind == nkSym and op.sym.isGenericRoutine:
         result.sons[1] = fitNode(c, result.typ, result.sons[1])
+      elif op.kind == nkPar and targetType.kind == tyTuple:
+        op = fitNode(c, targetType, op)
     of convNotNeedeed:
       message(n.info, hintConvFromXtoItselfNotNeeded, result.typ.typeToString)
     of convNotLegal:
diff --git a/tests/tuples/tconver_tuple.nim b/tests/tuples/tconver_tuple.nim
new file mode 100644
index 000000000..306da77fe
--- /dev/null
+++ b/tests/tuples/tconver_tuple.nim
@@ -0,0 +1,23 @@
+# Bug 4479
+
+type
+  MyTuple = tuple
+    num: int
+    strings: seq[string]
+    ints: seq[int]
+
+var foo = MyTuple((
+  num: 7,
+  strings: @[],
+  ints: @[],
+))
+
+var bar = (
+  num: 7,
+  strings: @[],
+  ints: @[],
+).MyTuple
+
+var fooUnnamed = MyTuple((7, @[], @[]))
+var n = 7
+var fooSym = MyTuple((num: n, strings: @[], ints: @[]))