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csharp-compiler-warnings

Skill1 starsChanged 4 months agoMITView on GitHub

Non-nullability C# compiler warning meanings and examples

We split this skill into the rules it gives an agent

1 rule. About 0 are common, 0 are distinctive, and 1 is very specific to this project.

  • ≈0

    Common · estimate

    Many files like this have a rule of this kind.

  • ≈0

    Distinctive · estimate

    This author's own choices. Worth a look.

  • 1

    Very specific

    Tied to their project's names, files or tools. Probably skip.

  • Common
  • Distinctive
  • Very specific
  1. Very specific:

    Use this skill for enabled C# compiler diagnostics that are not nullable-reference warnings.

    line 10

≈ “Common” is an estimate: at least 1 in 5 of the 308,232 skill files we read have a rule of the same kind, not the same words. “Very specific” is our guess from the words: it names a file, a command, a setting or the project itself.

Keep what fits and drop the rest. Your version, ready for your agents.
Files
SKILL.md

C# compiler warnings

C# compiler diagnostics (CS)

Use this skill for enabled C# compiler diagnostics that are not nullable-reference warnings. For nullable CS8xxx warnings, use ../nullability-warnings/SKILL.md.

CS0162 - Unreachable code detected

What it flags: The C# compiler reported code that is unreachable, unused, malformed, or inconsistent with language rules.

Example:

  • Bad: code after return, throw, or an always-false branch.
  • Fix: remove the unreachable statement or correct the control flow.

CS0168 - Variable is declared but never used

What it flags: The C# compiler reported code that is unreachable, unused, malformed, or inconsistent with language rules.

Example:

  • Bad: catch (Exception ex) { LogFailure(); } without using ex.
  • Fix: remove the variable or use it, for example in logging.

CS0219 - Variable is assigned but its value is never used

What it flags: The C# compiler reported code that is unreachable, unused, malformed, or inconsistent with language rules.

Example:

  • Bad: var result = Calculate(); and result is never read.
  • Fix: remove the assignment or use the value.

CS0628 - New protected member declared in sealed type

What it flags: The C# compiler reported code that is unreachable, unused, malformed, or inconsistent with language rules.

Example:

  • Bad: protected void M() in a sealed class.
  • Fix: make the member private or unseal the class if inheritance is intended.

CS1696 - Single-line comment or end-of-line expected

What it flags: The C# compiler reported code that is unreachable, unused, malformed, or inconsistent with language rules.

Example:

  • Bad: malformed preprocessor or comment syntax near a directive.
  • Fix: correct the directive/comment so the compiler can parse the line.

CS1998 - Async method lacks await operators

What it flags: The C# compiler reported code that is unreachable, unused, malformed, or inconsistent with language rules.

Example:

  • Bad: async Task SaveAsync() { Save(); } with no await.
  • Fix: remove async and return a completed task, or await real async work.

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