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code.InteractiveConsole.push attempts to support multi-line input when using an input method that doesn't reliably split on newlines.
This support fails as soon as the multi-line input contains multiple statements (including when the last statement is incomplete).
However, switching to 'exec' instead of 'single' causes other problems - specifically, it turns off the expression printing.
While expression printing could be implied by the PyCF_DONT_IMPLY_DEDENT flag in addition to the "single" evaluation mode, it seems cleaner to break out the expression printing behaviour into its own flag and setting it appropriately in the code and/or codeop modules.