src/RInternals/InternalContext.h [119:138]:
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  struct RCNTXT {
    struct RCNTXT *nextcontext;
    int callflag;
    JMP_BUF cjmpbuf;
    int cstacktop;
    int evaldepth;
    SEXP promargs;
    SEXP callfun;
    SEXP sysparent;
    SEXP call;
    SEXP cloenv;
    SEXP conexit;
    void (*cend)(void *);
    void *cenddata;
    void *vmax;
    int intsusp;
    int gcenabled;
    int bcintactive;
    SEXP bcbody;
    void* bcpc;
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src/RInternals/InternalContext.h [153:172]:
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  struct RCNTXT {
    struct RCNTXT *nextcontext;
    int callflag;
    JMP_BUF cjmpbuf;
    int cstacktop;
    int evaldepth;
    SEXP promargs;
    SEXP callfun;
    SEXP sysparent;
    SEXP call;
    SEXP cloenv;
    SEXP conexit;
    void (*cend)(void *);
    void *cenddata;
    void *vmax;
    int intsusp;
    int gcenabled;
    int bcintactive;
    SEXP bcbody;
    void* bcpc;
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