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/usr/include/zsh/lex.epro is in zsh-dev 5.1.1-1ubuntu2.3.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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/* Generated automatically */
#ifndef have_Src_lex_globals
#define have_Src_lex_globals

extern mod_import_variable char ztokens[];
extern char*zshlextext;
extern mod_import_variable char*tokstr;
extern mod_import_variable enum lextok tok;
extern mod_import_variable int tokfd;
extern zlong toklineno;
extern mod_import_variable int lexstop;
extern mod_import_variable int isfirstln;
extern int isfirstch;
extern int inalmore;
extern int nocorrect;
extern mod_import_variable int zlemetacs;
extern mod_import_variable int zlemetall;
extern mod_import_variable int inwhat;
extern mod_import_variable int addedx;
extern mod_import_variable int wb;
extern mod_import_variable int we;
extern mod_import_variable int wordbeg;
extern mod_import_variable int parbegin;
extern mod_import_variable int parend;
extern mod_import_variable int noaliases;
extern mod_import_variable int lexflags;
extern mod_import_variable int nocomments;
extern mod_import_variable char*tokstrings[WHILE+1];
extern void lex_context_save _((struct lex_stack*ls,int toplevel));
extern mod_import_function void lex_context_restore _((const struct lex_stack*ls,int toplevel));
extern void zshlex _((void));
extern mod_import_function void ctxtlex _((void));
extern void initlextabs _((void));
extern void lexinit _((void));
extern void add _((int c));
extern mod_import_function int parsestr _((char**s));
extern mod_import_function int parsestrnoerr _((char**s));
extern mod_import_function char*parse_subscript _((char*s,int sub,int endchar));
extern mod_import_function int parse_subst_string _((char*s));
extern int exalias _((void));
extern void zshlex_raw_add _((int c));
extern void zshlex_raw_back _((void));
extern int zshlex_raw_mark _((int offset));
extern void zshlex_raw_back_to_mark _((int mark));

#endif /* !have_Src_lex_globals */