Time: 0:00
Test a custom input to verify an edge case (e.g. empty lists, negative numbers, duplicates).
This bug belongs to the scope and closure bugs pattern
Every callback reports the last value, a counter never increments, UnboundLocalError on a variable you can see.
What went wrong: The variable 'discount' was shadowed by a new variable with the same name, masking the original discount percentage.
The fix: Rename the inner variable to 'discount_amount' to avoid shadowing.
Remember: In Rust, variable shadowing can mask earlier computations if not handled carefully.
The pattern behind it: scope and closure bugs.
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