GeezerVison

Problem

py.RunSrc fails with SyntaxError: 'invalid syntax' when the source contains more than one top-level statement — for example, two class definitions:

class A:
    pass


class B:
    pass

The equivalent py.RunFile path works fine.

Reported in #257.

Root cause

RunSrc compiled the source in SingleMode:

code, err := Compile(pySrc+"\n", pySrcDesc, SingleMode, 0, true)

SingleMode maps to Python's single/interactive grammar, which accepts only a single top-level statement. RunFile goes through ResolveAndCompile, which uses ExecMode (the file/module grammar that accepts a whole module of statements) — hence the discrepancy.

This has been present since RunSrc was introduced in 727b7c4.

Fix

Compile in ExecMode instead, matching RunFile and the semantics of Python's exec() for a source buffer.

Test

Adds TestRunSrcMultipleStatements in pytest (which imports both py and stdlib, avoiding the import cycle in the py package). Verified it fails against the old SingleMode code and passes with the fix. Full suite green.

Fixes #257