fix #8219; nim check/dump shouldn't run single nimscript project [backport: 1.6] (#19641)

* fix #8219; nim check/dump shouldn't run single nimscript project [backport: 1.6]

tests/misc/trunner.nim

@@ -249,6 +249,11 @@ tests/newconfig/bar/mfoo.nims""".splitLines
       expected.add &"Hint: used config file '{b}' [Conf]\n"
     doAssert outp.endsWith expected, outp & "\n" & expected
 
+  block: # bug #8219
+    let file = "tests/newconfig/mconfigcheck.nims"
+    let cmd = fmt"{nim} check --hints:off {file}"
+    check execCmdEx(cmd) == ("", 0)
+
   block: # mfoo2.customext
     let filename = testsDir / "newconfig/foo2/mfoo2.customext"
     let cmd = fmt"{nim} e --hint:conf {filename}"

tests/newconfig/mconfigcheck.nims

@@ -1,11 +1,9 @@
-discard """
-  cmd: "nim check $file"
-"""
-
 mode = ScriptMode.Verbose
 proc build() =
   echo "building nim... "
   exec "sleep 10"
+  exec "nonexistant command"
   echo getCurrentDir()
 
 echo "hello"
+build()