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Fix CS1525: Use C# 7.3-compatible null-coalescing for Unity 2019.4#37

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boxqkrtm merged 3 commits intomasterfrom
copilot/fix-compiler-error-visualstudio
Feb 12, 2026
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Fix CS1525: Use C# 7.3-compatible null-coalescing for Unity 2019.4#37
boxqkrtm merged 3 commits intomasterfrom
copilot/fix-compiler-error-visualstudio

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Copilot AI commented Feb 12, 2026 •
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Unity 2019.4 uses C# 7.3, which lacks the ??= operator (C# 8.0). This caused compilation failure at VisualStudioCursorInstallation.cs:587.

Changes

Wrapped the null-coalescing assignment with version-conditional compilation:

var workspace = TryFindWorkspace(directory);
// Use version-compatible null-coalescing for Unity 2019.4 (C# 7.3) support
#if UNITY_2020_2_OR_NEWER
    workspace ??= directory;
#else
    workspace = workspace ?? directory;
#endif
directory = workspace;

Pattern matches existing version guards in UnityInstallation.cs, ProjectGeneration.cs, and AssemblyNameProvider.cs.

Original prompt

This section details on the original issue you should resolve

<issue_title>Compiler error in VisualStudioCursorInstallation.cs CS1525: Invalid expression term '='</issue_title>
<issue_description>## Context
Unity 2019.4.41f1
Inherited legacy project.
Upgrading to newer version of Unity isn't possible in the short-term.

Error

Library\PackageCache\com.boxqkrtm.ide.cursor@53e1baac3c\Editor\VisualStudioCursorInstallation.cs(587,16): 
error CS1525: Invalid expression term '='

Fix

I'd open a PR, but I can't push my branch (more than happy to contribute if you'll have me). Replace line 587 in VisualStudioCursorInstallation.cs with the code below. You can also just use the C# 7.3 null-coalescing operator. But using the compiler directive as shown below expresses intent to future devs who may inadvertently apply the C# 8.0 operator again.

#if UNITY_2020_2_OR_NEWER
			workspace ??= directory;
#else
            workspace = workspace ?? directory;
#endif
```</issue_description>

<agent_instructions>Context
Unity 2019.4.41f1
Inherited legacy project.
Upgrading to newer version of Unity isn't possible in the short-term.

Error
Library\PackageCache\com.boxqkrtm.ide.cursor@53e1baac3c\Editor\VisualStudioCursorInstallation.cs(587,16): 
error CS1525: Invalid expression term '='
Fix
I'd open a PR, but I can't push my branch (more than happy to contribute if you'll have me). Replace line 587 in VisualStudioCursorInstallation.cs with the code below. You can also just use the C# 7.3 null-coalescing operator. But using the compiler directive as shown below expresses intent to future devs who may inadvertently apply the C# 8.0 operator again.

#if UNITY_2020_2_OR_NEWER
			workspace ??= directory;
#else
            workspace = workspace ?? directory;
#endif
</agent_instructions>

## Comments on the Issue (you are @copilot in this section)

<comments>
<comment_new><author>@boxqkrtm</author><body>
you can fork and make pr 👍 </body></comment_new>
</comments>

✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.

@boxqkrtm
Fix CS1525 compiler error for Unity 2019.4 by replacing ??= with vers…
412c992 
…ion-compatible code

Co-authored-by: boxqkrtm <8157743+boxqkrtm@users.noreply.github.com>
Copilot AI changed the title [WIP] Fix compiler error in VisualStudioCursorInstallation.cs Fix C# 7.3 compatibility for Unity 2019.4 Feb 12, 2026
Copilot AI requested a review from boxqkrtm February 12, 2026 09:59
@boxqkrtm
Add clarifying comment for Unity 2019.4 C# 7.3 compatibility
8e1da25 
Co-authored-by: OmarAlFarajat <OmarAlFarajat@users.noreply.github.com>

Co-authored-by: boxqkrtm <8157743+boxqkrtm@users.noreply.github.com>
Copilot AI changed the title Fix C# 7.3 compatibility for Unity 2019.4 Fix C# 7.3 compatibility for Unity 2019.4 (CS1525 compiler error) Feb 12, 2026
Copilot AI changed the title Fix C# 7.3 compatibility for Unity 2019.4 (CS1525 compiler error) Fix CS1525: Use C# 7.3-compatible null-coalescing for Unity 2019.4 Feb 12, 2026
@boxqkrtm boxqkrtm marked this pull request as ready for review February 12, 2026 10:53
boxqkrtm
boxqkrtm approved these changes Feb 12, 2026
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tested

@boxqkrtm boxqkrtm merged commit d17d781 into master Feb 12, 2026
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Compiler error in VisualStudioCursorInstallation.cs CS1525: Invalid expression term '='

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