fixes #8434 (incomplete info in errmsg about 'required type') (#8441)

compiler/types.nim

@@ -496,9 +496,15 @@ proc typeToString(typ: PType, prefer: TPreferedDesc = preferName): string =
       add(result, typeToString(t.sons[i]))
     result.add "]"
   of tyAnd:
-    result = typeToString(t.sons[0]) & " and " & typeToString(t.sons[1])
+    for i, son in t.sons:
+      result.add(typeToString(son))
+      if i < t.sons.high:
+        result.add(" and ")
   of tyOr:
-    result = typeToString(t.sons[0]) & " or " & typeToString(t.sons[1])
+    for i, son in t.sons:
+      result.add(typeToString(son))
+      if i < t.sons.high:
+        result.add(" or ")
   of tyNot:
     result = "not " & typeToString(t.sons[0])
   of tyExpr:

tests/errmsgs/t8434.nim

@@ -0,0 +1,16 @@
+discard """
+  errormsg: "type mismatch: got <byte, int literal(0)>"
+  nimout: '''but expected one of:
+proc fun0[T1: int | float |
+    object | array | seq](a1: T1; a2: int)
+  first type mismatch at position: 1
+  required type: T1: int or float or object or array or seq
+  but expression 'byte(1)' is of type: byte
+
+expression: fun0(byte(1), 0)
+'''
+"""
+
+proc fun0[T1:int|float|object|array|seq](a1:T1, a2:int)=discard
+
+fun0(byte(1), 0)