[Feature Request][compiler-v2] Dead code analysis

[sausagee]

Identify dead code and produce errors for it. Also identify unused types, functions, variables and fields

[wrwg]

Includes detecting unreachable code. Includes unused variables which are not starting with _.

[vineethk]

To add a bit more structure, here is a list of various warnings that need to be implemented in v2:

• unused assignment
• dead or unreachable code
• unused type parameter
• unused attribute
• unused parameter
• unused local
• unnecessary trailing semicolon
• invalid use of divergent expression

The plan is to break these down into smaller pieces and tackle them.

[vineethk]

I have broken this issue up into multiple smaller independent ones:

• [Feature Request][compiler-v2] Implement unused parameter and unused local warnings #11704
• [Feature Request][compiler-v2] Implement unused attributes warning #11706
• [Feature Request][compiler-v2] Implement dead or unreachable code warning #11707
• [Feature Request][compiler-v2] Implement a warning for unnecessary trailing semicolon #11708
• [Feature Request][compiler-v2] Implement unused struct type parameter warning #11709
• [Feature Request][compiler-v2] Implement unused assignment warning #11710

So, closing this one.