8000 No panic on symbol lookup fail by arihant2math · Pull Request #5555 · RustPython/RustPython · GitHub
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No panic on symbol lookup fail #5555

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no panic on symbol lookup fail 
Signed-off-by: Ashwin Naren <arihant2math@gmail.com>
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@arihant2math
arihant2math committed Mar 3, 2025
commit aeb9715ae66e23263763da06a792bd2cc5b83acb
14 changes: 11 additions & 3 deletions compiler/codegen/src/compile.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -507,9 +507,17 @@ impl Compiler {
self.check_forbidden_name(&name, usage)?;

let symbol_table = self.symbol_table_stack.last().unwrap();
let symbol = symbol_table.lookup(name.as_ref()).unwrap_or_else(||
panic!("The symbol '{name}' must be present in the symbol table, even when it is undefined in python."),
);
let symbol = match symbol_table.lookup(name.as_ref()) {
Some(s) => s,
None => {
return Err(self.error_loc(
CodegenErrorType::SymbolLookupError {
symbol: name.to_string(),
},
self.current_source_location,
));
}
};
let info = self.code_stack.last_mut().unwrap();
let mut cache = &mut info.name_cache;
enum NameOpType {
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4 changes: 4 additions & 0 deletions compiler/codegen/src/error.rs
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Expand Up @@ -33,6 +33,7 @@ pub enum CodegenErrorType {
DuplicateStore(String),
InvalidMatchCase,
NotImplementedYet, // RustPython marker for unimplemented features
SymbolLookupError { symbol: String },
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Because this is not a user-side Python error but our own RustPython implementation bug, let's not expose it here.

}

impl std::error::Error for CodegenErrorType {}
Expand Down Expand Up @@ -85,6 +86,9 @@ impl fmt::Display for CodegenErrorType {
}
NotImplementedYet => {
write!(f, "RustPython does not implement this feature yet")
},
SymbolLookupError { symbol } => {
write!(f, "The symbol {symbol} must be present in the symbol table, even when it is undefined in python")
}
}
}
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