source: tests/exceptions/interact.cfa @ aa144c5a

// Testing Interactions Between Termination and Resumption

#include "except-io.hfa"

exception star {};
exception moon {};

vtable(star) star_vt;
vtable(moon) moon_vt;

int main(int argc, char * argv[]) {
        // Resume falls back to terminate.
        try {
                throwResume (star){&star_vt};
        } catch (star *) {
                printf("caught as termination\n");
        }
        // Variant of the above to check timing.
        try {
                loud_region a = "try block with resume throw";
                throwResume (star){&star_vt};
        } catch (star *) {
                printf("caught as termination\n");
        } catchResume (star *) {
                printf("intermediate rethrow\n");
                throwResume;
        }
        printf("\n");

        // Resume does not catch terminate.
        try {
                try {
                        throw (star){&star_vt};
                } catchResume (star *) {
                        printf("resume catch on terminate\n");
                }
        } catchResume (star *) {
                printf("resume catch on terminate\n");
        } catch (star *) {
                printf("terminate catch on terminate\n");
        }
        printf("\n");

        // Terminate does not catch resume.
        try {
                try {
                        throwResume (star){&star_vt};
                } catch (star *) {
                        printf("terminate catch on resume\n");
                }
        } catch (star *) {
                printf("terminate catch on resume\n");
        } catchResume (star *) {
                printf("resume catch on resume\n");
        }
        printf("\n");

        // Resume a termination exception.
        try {
                try {
                        try {
                                throw (star){&star_vt};
                        } catchResume (star *) {
                                printf("inner resume catch (error)\n");
                        }
                } catch (star * error) {
                        printf("termination catch, will resume\n");
                        throwResume *error;
                }
        } catchResume (star *) {
                printf("outer resume catch\n");
        }
        printf("\n");

        // Terminate a resumption exception.
        try {
                try {
                        try {
                                throwResume (star){&star_vt};
                        } catch (star *) {
                                printf("inner termination catch\n");
                        }
                } catchResume (star * error) {
                        printf("resumption catch, will terminate\n");
                        throw *error;
                }
        } catch (star *) {
                printf("outer terminate catch (error)\n");
        }
        printf("\n");

        // Unwinding a resumption catch does not break the system.
        try {
                try {
                        try {
                                try {
                                        printf("throwing resume moon\n");
                                        throwResume (moon){&moon_vt};
                                } catch (star *) {
                                        printf("termination catch\n");
                                }
                                printf("throwing resume star\n");
                                throwResume (star){&star_vt};
                        } catchResume (star *) {
                                printf("resumption star catch\n");
                        }
                } catchResume (moon *) {
                        printf("resumption moon catch, will terminate\n");
                        throw (star){&star_vt};
                }
        } catchResume (star *) {
                printf("outermost catch (error)\n");
        }
}