我有一些使用Megaparsec的解析代码，我已经编写了一个简单的属性进行测试（它会生成一个随机表达式树，对其进行漂亮打印，然后检查结果是否可以解析回原始树）。

不幸的是，这似乎是一个错误，如果我不受限制地运行测试，我会看到GHC进程分配了越来越多的内存，直到我杀死它或OOM杀手先到达那里。

我认为这不是问题，但是我无法一生找出导致分歧的原因。该属性本身看起来像这样：（我已经剔除了适当的测试和缩小的代码，以尽量减少实际运行的代码）

prop_parse_expr :: Property
prop_parse_expr =
  forAll arbitrary $
  (\ pe ->
     let str = prettyParExpr 0 pe in
       counterexample ("Rendered to: " ++ show str) $
       trace ("STARTING TEST: " ++ show str) $
       case parse (expr <* eof) "" str of
         Left _ -> trace "NOPE" $ False
         Right _ -> trace "GOOD" $ True)

如果使用性能分析进行编译（使用stack test --profile），则可以使用RTS选项运行生成的二进制文件。啊，我想，并与-xc一起运行，以为将SIGINT发送给被卡住的作业时会得到有用的堆栈跟踪。好像没有与

./long/path/to/foo-test -j1 --test-seed 1 +RTS -xc

我看到以下输出：

STARTING TEST: "0"
GOOD
STARTING TEST: "(x [( !0 )]) "
STARTING TEST: "({ 2 {( !0 )}} ) "
STARTING TEST: "{ 2{ ( x[0? {( 0),( x ) } :((0 )? (x ):0) -: ( -(^( x  )) ) ]),0**( x )} } "
STARTING TEST: "| (0? (x[({ 1{ (0)? x : ( 0 ) }} ) ]) :(~&( 0) ?( x):( (x ) ^( x ) )))"
STARTING TEST: "(0 )"
STARTING TEST: "0"
^C*** Exception (reporting due to +RTS -xc): (THUNK_STATIC),stack trace: 
  Test.Framework.Improving.runImprovingIO,called from Test.Framework.Providers.QuickCheck2.runProperty,called from Test.Framework.Providers.QuickCheck2.runTest,called from Test.Framework.Runners.Core.runSimpleTest,called from Test.Framework.Runners.Core.runTestTree.go,called from Test.Framework.Runners.Core.runTestTree,called from Test.Framework.Runners.Core.runTests',called from Test.Framework.Runners.Core.runTests,called from Test.Framework.Runners.Console.defaultMainWithOpts,called from Test.Framework.Runners.Console.defaultMainWithArgs,called from Test.Framework.Runners.Console.defaultMain,called from Main.main
<snip: 2 more identical backtraces>
*** Exception (reporting due to +RTS -xc): (THUNK_STATIC),stack trace: 
  Test.Framework.Runners.Console.Utilities.hideCursorDuring,called from Test.Framework.Runners.Console.Run.showRunTestsTop,called from Test.Framework.Improving.runImprovingIO,called from Main.main

谁能告诉我：

1. 为什么我看到多条STARTING TEST行之间没有GOOD或NOPE，尽管有-j1？

2. 我如何获得实际的堆栈跟踪信息，以显示测试在哪里分配所有内存？

感谢任何想法！