Fix NextSolverError

✅ Solution

NextSolverError typically arises when the type solver encounters an unexpected successful goal state while trying to resolve ambiguity or handle complex type constraints, especially with features like `impl Trait` or generic constants. The fix involves carefully examining the type checking logic around the reported location to identify incorrect assumptions about goal states, and ensuring that error handling gracefully manages seemingly successful goals that actually indicate unresolved ambiguity. This might require refining the solver's logic to correctly identify genuinely resolved types and prevent premature success signals.