Fixes #710.

compiler/semcall.nim

@@ -81,6 +81,8 @@ proc notFoundError*(c: PContext, n: PNode, errors: seq[string]) =
   if c.inCompilesContext > 0: 
     # fail fast:
     globalError(n.info, errTypeMismatch, "")
+  if errors.len == 0:
+    localError(n.info, errExprXCannotBeCalled, n[0].renderTree)
   var result = msgKindToString(errTypeMismatch)
   add(result, describeArgs(c, n, 1))
   add(result, ')')

tests/misc/tissue710.nim

@@ -0,0 +1,10 @@
+discard """
+  file: "tissue710.nim"
+  line: 8
+  errorMsg: "expression '||' cannot be called"
+"""
+var sum = 0
+for x in 3..1000:
+  if (x mod 3 == 0) || (x mod 5 == 0):
+    sum += x
+echo(sum)