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codegen: module seed CodeInfo emits empty flags #7782

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Merged
youknowone merged 1 commit into from
May 5, 2026
Merged

codegen: module seed CodeInfo emits empty flags #7782

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10 changes: 9 additions & 1 deletion crates/codegen/src/compile.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -505,7 +505,15 @@ impl Compiler {

fn new(opts: CompileOpts, source_file: SourceFile, code_name: String) -> Self {
let module_code = ir::CodeInfo {
flags: bytecode::CodeFlags::NEWLOCALS,
// CPython convention: top-level module / interactive /
// expression code does not carry CO_NEWLOCALS or CO_OPTIMIZED.
// (See `Python/compile.c compiler_enter_scope` for module
// scope.) This matches the per-scope mapping at
// enter_scope::CompilerScope::Module below, which also returns
// empty flags. frame.rs:725-731 then binds locals to globals
// for module/REPL frames whose `scope.locals` is None — the
// correct semantics for `exec(code, globals)` and module init.
flags: bytecode::CodeFlags::empty(),
source_path: source_file.name().to_owned(),
private: None,
blocks: vec![ir::Block::default()],
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