The Yul optimizer can remove essential assignments to variables declared inside for loops when Yul's continue or break statement is used mostly while using inline assembly with for loops and continue and break statements. This is due to a compiler bug introduced in v0.5.8/v0.6.0 and fixed in v0.5.16/v0.6.1. (see here)
- Essential Assignments Removed
- YUL Optimizer Variable -> for Loops
- continue/break Assignments -> Removed
- Compiler Bug -> Fixed
solc 0.5.8/0.6.0-> 0.5.16/0.6.1