Planned
Last Updated: 13 Feb 2026 12:24 by ADMIN
Scheduled for 2026 Q2
Ivo
Created on: 27 Jun 2025 14:07
Category: JustMock
Type: Bug Report
1
Using JustMock could cause unexpected debugger errors

To replicate the problem using the provided project, follow these steps:

1. Open the solution in Rider.
2. Set breakpoints at the beginning of the test.
3. Start debugging the test.
4. Step into the constructor of the Car class and inspect the contents of the array. Note that if this step is skipped, the issue will not be reproducible.
5. Step out of the constructor.
6. Continue execution until just before calling the virtual function for the Number property.
7. Step into the function.

**EXPECTED** The value of Name should be visible.

**ACTUAL** A debugger error occurs.

The issue can appear in both Visual Studio (showing "Internal error in the C# compiler") and Rider (showing "Read out of bounds"). 


Attached Files:
1 comment
ADMIN
Valentina
Posted on: 11 Feb 2026 14:55

Hello, everyone!

The issue has been successfully reproduced on our side and occurs only when debugging in JetBrains Rider. It does not appear in Visual Studio, which points to behavior specific to Rider’s debugging engine.

The Rider team has already been contacted regarding this, and a response is currently awaited. Their input should help clarify the underlying cause and whether any adjustments are required on either side.

Although an investigation was initially planned for Q1 2026, a fix could not be completed in that timeframe. The issue remains open and actively tracked, and the thread will be updated as soon as new information becomes available.


Valentina
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