Lean: import Lean module, and noncomputable sections #1018
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This is useful for the RISC-V model which requires some functions to be implemented by the backend. To add a file, use the --lean-import-file option, it can be repeated. If we want to do as the Coq backend and have some of these functions be axioms in order to leave them arbitrary, we need to declare the whole output as noncomputable, which is controlled by a new option --lean-noncomputable.
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This is useful for the RISC-V model which requires some functions to be implemented by the backend. To add a file, use the --lean-import-file option, it can be repeated.
If we want to do as the Coq backend and have some of these functions be axioms in order to leave them arbitrary, we need to declare the whole output as noncomputable, which is controlled by a new option --lean-noncomputable.
This branch of the RISC-V model uses these options.