Bug 3571 - invalid opcode pop generated with Void generic parameter
Summary: invalid opcode pop generated with Void generic parameter
Alias: None
Product: Compilers
Classification: Mono
Component: C# ()
Version: unspecified
Hardware: PC Mac OS
: --- normal
Target Milestone: ---
Assignee: Marek Safar
Depends on:
Reported: 2012-02-21 20:44 UTC by Evan
Modified: 2012-02-23 20:11 UTC (History)
1 user (show)

Is this bug a regression?: ---
Last known good build:

Simple case that produces the bug (338 bytes, application/octet-stream)
2012-02-21 20:44 UTC, Evan

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Description Evan 2012-02-21 20:44:08 UTC
The attached code compiles fine but when run gives the following error:

  Invalid IL code in Bug.MainClass/Holder`1<void>:Run (Bug.MainClass/Node): IL_0006: pop       
    at Bug.MainClass.Main (System.String[] args) [0x00000] in /Users/evan/Desktop/Bug/Main.cs:25

This is using mono -V == 2.6.7 on Linux and mono -V == 2.10.8 on OS X.
Comment 1 Evan 2012-02-21 20:44:48 UTC
Created attachment 1400 [details]
Simple case that produces the bug
Comment 2 Marek Safar 2012-02-22 06:17:31 UTC
Fixed in master.

Your code is actually not valid C# program
Comment 3 Evan 2012-02-23 02:00:17 UTC
This code should in that case cause a compile error and not generate invalid IL code, correct? I just compiled mono from source and this still generates invalid IL code.
Comment 4 Marek Safar 2012-02-23 03:34:21 UTC
Correct, it should issue compiler error.

Did you compile mono master ?
Comment 5 Evan 2012-02-23 20:11:43 UTC
No, I compiled from an archive downloaded off of mono-project.com. Building from github.com/mono/mono gives the following error, as expected:

Main.cs(25,36): error CS0673: System.Void cannot be used from C#. Consider using `void'