Compilation Errors
"Undefined function"
**Problem:** Function not imported or doesn't exist
**Fix:** Check module imports and function names
"Type mismatch"
**Problem:** Incompatible types
**Fix:** Verify all type annotations match
"Missing shadow test"
**Problem:** Function lacks shadow test
**Fix:** Add shadow block with assertions
"Bounds checking failed"
**Problem:** Array index out of bounds
**Fix:** Verify array length before access
Runtime Errors
"Assertion failed"
**Problem:** Runtime assertion evaluated to false
**Fix:** Check logic and test data
"Division by zero"
**Problem:** Attempted division by zero
**Fix:** Add guard condition
"Null pointer"
**Problem:** Accessing freed or null opaque type
**Fix:** Verify resource lifecycle
Syntax Errors
"Expected ')'"
**Problem:** Unmatched parentheses
**Fix:** Count opening and closing parens
"Unexpected token"
**Problem:** Invalid syntax
**Fix:** Check canonical style guide
**See also:** docs/DEBUGGING_GUIDE.md
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