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All the code-generator options can now be controlled via a json
configuration file
Extra fields can be added to the sail_state struct using a
codegen.extra_state key in the configuration json for the code
generator
If primitives want to modify the state they can be specified via
codegen.state_primops
To import such state, codegen.extra_headers can be used to add
user-defined headers to the generated .h file
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Also make the Error type private, so it's only constructed through the
functions we expose in reporting.mli
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Also add a $suppress_warnings directive that ensures that no warnings
are generated for a specific file.
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Add a new short_loc_to_string function that produces just the file and line number as
a single line. loc_to_string adds a bunch of terminal color codes and other formatting
designed for producing pretty error-messages in the terminal, which isn't ideal when
the string appears in prover output as part of an assert statement. This is should be
purely an aesthetic change.
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Work on improving the formatting and quality of error messages
When sail is invoked with sail -i, any type errors now drop the user
down to the interactive prompt, with the interactive environment being
the environment at the point the type error occurred, this means the
typechecker state can be interactively queried in the interpreter to help
diagnose type errors.
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Also fix some C optimisations
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There is no Reporting_complex, so it's not clear what the basic is
intended to signify anyway.
Add a GitHub issue link to any err_unreachable errors (as they are all
bugs)
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