使用 F# 的递归函数和断点
考虑以下代码：
[<EntryPoint>]
let main (args: string []) =
let rec main time =
let newTime = time + 2 // place a breakpoint at this line
main newTime
main 0
我无法在标记行处放置断点。我在使用递归函数时经常遇到这样的问题，这真的让我不想使用它们。有什么简单的解决方案吗？
编辑：我创建一个全新的解决方案，我的构建命令如下所示：
'------ 构建开始：项目：ConsoleApplication4，配置：调试 x86 ------ C:\Program Files (x86)\Microsoft F#\v4.0\fsc.exe -o:obj\x86\Debug\ConsoleApplication4.exe -g --debug:full --noframework --define:DEBUG --define: TRACE --doc:bin\Debug\ConsoleApplication4.XML --optimize- --tailcalls- --platform:x86 -r:"C:\Program Files (x86)\Reference程序集\Microsoft\FSharp\2.0\Runtime\v4.0\FSharp.Core.dll" -r:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETFramework\v4.0\Profile\Client\ mscorlib.dll" -r:"C:\Program Files (x86)\Reference程序集\Microsoft\Framework.NETFramework\v4.0\Profile\Client\System.Core.dll" -r:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETFramework\v4.0\Profile\ Client\System.dll" -r:"C:\Program Files (x86)\Reference程序集\Microsoft\Framework.NETFramework\v4.0\Profile\Client\System.Numerics.dll" --target:exe --warn:3 --warnaserror:76 --vserrors --LCID:1033 --utf8output --完整路径--扁平错误“C：\ Users \ olsv \ AppData \ Local \ Temp.NETFramework，版本= v4.0，配置文件= Client.AssemblyAttributes.fs” Program.fs 控制台应用程序4 -> d:\olsv\documents\Visual Studio 2010\Projects\ConsoleApplication4\ConsoleApplication4\bin\Debug\ConsoleApplication4.exe ========== 构建：1 成功或最新，0 失败，0 跳过 =========='
Consider the following code:
[<EntryPoint>]
let main (args: string []) =
let rec main time =
let newTime = time + 2 // place a breakpoint at this line
main newTime
main 0
I am not able to place a breakpoint at the marked line. I meet such problems quite often when using recursive functions and it really makes me not to use them. Is there any simple solution for that?
EDIT: I create a brand new solution and my build command looks like:
'------ Build started: Project: ConsoleApplication4, Configuration: Debug x86 ------
C:\Program Files (x86)\Microsoft F#\v4.0\fsc.exe -o:obj\x86\Debug\ConsoleApplication4.exe -g --debug:full --noframework --define:DEBUG --define:TRACE --doc:bin\Debug\ConsoleApplication4.XML --optimize- --tailcalls- --platform:x86 -r:"C:\Program Files (x86)\Reference Assemblies\Microsoft\FSharp\2.0\Runtime\v4.0\FSharp.Core.dll" -r:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETFramework\v4.0\Profile\Client\mscorlib.dll" -r:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETFramework\v4.0\Profile\Client\System.Core.dll" -r:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETFramework\v4.0\Profile\Client\System.dll" -r:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETFramework\v4.0\Profile\Client\System.Numerics.dll" --target:exe --warn:3 --warnaserror:76 --vserrors --LCID:1033 --utf8output --fullpaths --flaterrors "C:\Users\olsv\AppData\Local\Temp.NETFramework,Version=v4.0,Profile=Client.AssemblyAttributes.fs" Program.fs
ConsoleApplication4 -> d:\olsv\documents\visual studio 2010\Projects\ConsoleApplication4\ConsoleApplication4\bin\Debug\ConsoleApplication4.exe
========== Build: 1 succeeded or up-to-date, 0 failed, 0 skipped =========='
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评论（2）
我尝试调试您发布的代码，它似乎工作得很好（我使用的是 Visual Studio 2010 SP1）。当我放置断点并运行代码（作为控制台应用程序）时，它会重复在断点处停止，我可以单步执行到下一个表达式并查看局部变量的状态。
您可以尝试检查编译器标志 - 当您禁用优化和尾部调用时，调试效果最好（这可能与递归函数特别相关）。当我构建项目时，标志包括以下内容：
--debug:full --optimize- --tailcalls-。I tried debugging the code you posted and it seems to be working just fine (I'm using Visual Studio 2010 SP1). When I place the breakpoint and run the code (as a console application) it stops at the breakpoint repeatedly and I can step to the next expression and see the state of local variables.
You could try checking compiler flags - the debugging works the best when you disable optimizations and tail-calls (this may be particularly relevant to recursive functions). When I build the project, the flags include the following:
--debug:full --optimize- --tailcalls-.所以看起来，这是一个错误。我已经向 F# 团队报告了。所以我们希望他们能尽快修复它！
So it looks like, that it is a bug. I have already reported it to the F# team. So lets hope that they will fix it soon!