diff --git a/c/tex_parser/tex_parser.geany b/c/tex_parser/tex_parser.geany
index d5a8ccf..114e582 100644
--- a/c/tex_parser/tex_parser.geany
+++ b/c/tex_parser/tex_parser.geany
@@ -16,18 +16,18 @@ long_line_behaviour=1
 long_line_column=72
 
 [files]
-current_page=10
-FILE_NAME_0=1032;C;0;16;1;1;1;/home/kolan/dev/c/tex_parser/tex_parser_test.c;0
-FILE_NAME_1=1320;C;0;16;1;1;1;/home/kolan/dev/c/tex_parser/tex_parser.c;0
+current_page=7
+FILE_NAME_0=846;C;0;16;1;1;1;/home/kolan/dev/c/tex_parser/tex_parser_test.c;0
+FILE_NAME_1=284;C;0;16;1;1;1;/home/kolan/dev/c/tex_parser/tex_parser.c;0
 FILE_NAME_2=655;C;0;16;1;1;1;/home/kolan/dev/c/tex_parser/tex_parser_tags.h;0
-FILE_NAME_3=1871;Make;0;16;1;1;1;/home/kolan/dev/c/tex_parser/Makefile;0
-FILE_NAME_4=334;C;0;16;1;1;1;/home/kolan/dev/c/tex_parser/tex_parser.h;0
-FILE_NAME_5=0;C;0;16;1;1;1;/home/kolan/projects/include/xerror.c;0
-FILE_NAME_6=1146;C;0;16;1;1;1;/home/kolan/projects/include/xerror.h;0
-FILE_NAME_7=3137;C;0;16;1;1;1;/home/kolan/projects/include/zerror.c;0
-FILE_NAME_8=1902;C;0;16;1;1;1;/home/kolan/projects/include/zerror.h;0
-FILE_NAME_9=2406;C;0;16;1;1;1;/home/kolan/projects/include/xalloc.c;0
-FILE_NAME_10=3312;C;0;16;1;1;1;/home/kolan/projects/include/xalloc.h;0
+FILE_NAME_3=1952;Make;0;16;1;1;1;/home/kolan/dev/c/tex_parser/Makefile;0
+FILE_NAME_4=410;C;0;16;1;1;1;/home/kolan/dev/c/tex_parser/tex_parser.h;0
+FILE_NAME_5=1858;C;0;16;1;1;1;/home/kolan/projects/include/xerror.c;0
+FILE_NAME_6=877;C;0;16;1;1;1;/home/kolan/projects/include/xerror.h;0
+FILE_NAME_7=1049;C;0;16;1;1;1;/home/kolan/projects/include/zerror.c;0
+FILE_NAME_8=1912;C;0;16;1;1;1;/home/kolan/projects/include/zerror.h;0
+FILE_NAME_9=1649;C;0;16;1;1;1;/home/kolan/projects/include/xalloc.c;0
+FILE_NAME_10=4903;C;0;16;1;1;1;/home/kolan/projects/include/xalloc.h;0
 
 [build-menu]
 NF_00_LB=_Сделать
diff --git a/c/zerror_test/Makefile b/c/zerror_test/Makefile
new file mode 100644
index 0000000..80c796a
--- /dev/null
+++ b/c/zerror_test/Makefile
@@ -0,0 +1,69 @@
+CC=cc
+CXX=c++
+INCLUDE=-I$(HOME)/projects/include
+KOLAN_PROJECTS=$(HOME)/projects
+KOLAN_INCLUDE=$(KOLAN_PROJECTS)/include
+
+# Compiler flags
+# if mode variable is empty, setting debug build mode
+ifeq ($(mode),)
+	mode = debug
+endif
+ifeq ($(mode),debug)
+	CFLAGS = -O0 -g -std=gnu99 -pedantic -Wextra -Wconversion
+	LDFLAGS =
+endif
+ifeq ($(mode),profile)
+	CFLAGS = -O0 -g -p -ftest-coverage -Wcoverage-mismatch
+	LDFLAGS = -g -p
+endif
+ifeq ($(mode),develop)
+	CFLAGS += -O2 -g
+	LDFLAGS += -O1
+endif
+ifeq ($(mode),release)
+	CFLAGS += -O2
+	LDFLAGS += -O1
+endif
+
+CFLAGS += -Wall
+#~ $(shell pkg-config --cflags liblist)
+LDFLAGS += -Wall
+#~ $(shell pkg-config --libs liblist) -lpthread -lexpat
+
+all: zerror_test
+
+ifneq ($(mode),debug)
+ifneq ($(mode),profile)
+ifneq ($(mode),develop)
+ifneq ($(mode),release)
+	@echo "Invalid build mode."
+	@echo "Please use 'make mode=release', 'make mode=develop' or 'make mode=debug'"
+	@exit 1
+endif
+endif
+endif
+endif
+	@echo ".........................."
+	@echo "Building on "$(mode)" mode "
+	@echo "CFLAGS=$(CFLAGS)"
+	@echo "LDFLAGS=$(LDFLAGS)"
+	@echo ".........................."
+
+%.o :
+	$(CC) -c $(CFLAGS) $(LDFLAGS) $(INCLUDE) -o $@ $<
+
+zerror_test_obj = zerror_test.o zerror.o xerror.o
+zerror_test: $(zerror_test_obj)
+	$(CC) $(CFLAGS) $(LDFLAGS) $(INCLUDE) -o $@ $(zerror_test_obj)
+
+zerror_test.o: zerror_test.c $(KOLAN_INCLUDE)/zerror.h $(KOLAN_INCLUDE)/xerror.h
+
+zerror.o: $(KOLAN_INCLUDE)/zerror.c $(KOLAN_INCLUDE)/zerror.h $(KOLAN_INCLUDE)/xerror.h
+
+xerror.o: $(KOLAN_INCLUDE)/xerror.c $(KOLAN_INCLUDE)/xerror.h
+
+clean:
+	$(RM) *.o *.out callgrind.out.* *.gcno tex_parser_test
+
+.PHONY: all clean
diff --git a/c/zerror_test/zerror_test.c b/c/zerror_test/zerror_test.c
new file mode 100644
index 0000000..00dd9c5
--- /dev/null
+++ b/c/zerror_test/zerror_test.c
@@ -0,0 +1,70 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "zerror.h"
+
+void test0()
+{
+	struct zerror_s *zs, *zs_l, *zs_cp, *zs_se = NULL, *zs_se_l = NULL, *zs_pe = NULL, *zs_pe2 = NULL;
+
+	zs = zerror_new(-12, -45, "error № %d, %s", -8752, "некая строка");
+
+	printf("zerror_new = {%d, %d, %s}\n", zs->domain, zs->code, zs->message);
+
+	zs_l = zerror_new_literal(-52, -8954, "литерал");
+
+	printf("zerror_new_literal = {%d, %d, %s}\n", zs_l->domain, zs_l->code, zs_l->message);
+
+	zs_cp = zerror_copy(zs_l);
+
+	printf("zerror_copy = {%d, %d, %s}\n", zs_cp->domain, zs_cp->code, zs_cp->message);
+
+	printf("zerror_matches(-52, -8954) = %d\n", zerror_matches(zs_cp, -52, -8954));
+	printf("zerror_matches(-53, -8954) = %d\n", zerror_matches(zs_cp, -53, -8954));
+	printf("zerror_matches(-52, -1954) = %d\n", zerror_matches(zs_cp, -52, -1954));
+
+	/* indicates error in smb's code */
+	z_set_error(&zs, -928, -894, "error was set by z_set_error(%d, %d)", -928, -894);
+	printf("ERRinSMB'sCODE: z_set_error = {%d, %d, %s}\n", zs->domain, zs->code, zs->message);
+
+	z_set_error(&zs_se, -928, -894, "error was set by z_set_error(%d, %d)", -928, -894);
+	printf("z_set_error = {%d, %d, %s}\n", zs_se->domain, zs_se->code, zs_se->message);
+
+	/* indicates error in smb's code */
+	z_set_error_literal(&zs, -928, -894, "error was set by z_set_error_literal()");
+	printf("ERRinSMB'sCODE: z_set_error_literal = {%d, %d, %s}\n", zs->domain, zs->code, zs->message);
+
+	z_set_error_literal(&zs_se_l, -928, -894, "error was set by z_set_error_literal()");
+	printf("z_set_error_literal = {%d, %d, %s}\n", zs_se_l->domain, zs_se_l->code, zs_se_l->message);
+
+	/* indicates error in smb's code */
+	z_propagate_error(&zs, zs_se);
+	printf("ERRinSMB'sCODE: z_propagate_error = {%d, %d, %s}\n", zs->domain, zs->code, zs->message);
+
+	z_propagate_error(&zs_pe, zs_se);
+	printf("z_propagate_error = {%d, %d, %s}\n", zs_pe->domain, zs_pe->code, zs_pe->message);
+
+	z_prefix_error(&zs_pe, "prefix(%s): ", "PREFIX");
+	printf("z_prefix_error = {%d, %d, %s}\n", zs_pe->domain, zs_pe->code, zs_pe->message);
+
+	z_propagate_prefixed_error(&zs_pe2, zs_se_l, "prefix_propagate(%s): ", "propagated");
+	printf("z_propagate_prefixed_error = {%d, %d, %s}\n", zs_pe2->domain, zs_pe2->code, zs_pe2->message);
+
+	zerror_free(zs);
+	zs_l = zerror_free_null(zs_l);
+	zerror_free(zs_cp);
+	//~ z_clear_error(&zs_se_l); // not need clear, because zs_se_l propagated to zs_pe2
+	//~ z_clear_error(&zs_se); // not need clear, because zs_se propagated to zs_pe
+	z_clear_error(&zs_pe);
+
+
+
+}
+
+int main(/*int argc, char *argv[]*/)
+{
+	test0();
+
+	return EXIT_SUCCESS;
+}
diff --git a/c/zerror_test/zerror_test.geany b/c/zerror_test/zerror_test.geany
new file mode 100644
index 0000000..2c8550a
--- /dev/null
+++ b/c/zerror_test/zerror_test.geany
@@ -0,0 +1,44 @@
+
+[indentation]
+indent_width=8
+indent_type=1
+indent_hard_tab_width=8
+detect_indent=false
+indent_mode=2
+
+[project]
+name=zerror_test
+base_path=/home/kolan/dev/c/zerror_test/
+description=
+
+[long line marker]
+long_line_behaviour=1
+long_line_column=72
+
+[files]
+current_page=0
+FILE_NAME_0=0;C;0;16;1;1;1;/home/kolan/dev/c/zerror_test/zerror_test.c;0
+FILE_NAME_1=1300;Make;0;16;1;1;1;/home/kolan/dev/c/zerror_test/Makefile;0
+FILE_NAME_2=2162;C;0;16;1;1;1;/home/kolan/projects/include/zerror.c;0
+FILE_NAME_3=0;C;0;16;1;1;1;/home/kolan/projects/include/zerror.h;0
+
+[build-menu]
+NF_00_LB=_Сделать
+NF_00_CM=make
+NF_00_WD=%p
+NF_01_LB=Сделать заданную _цель
+NF_01_CM=make 
+NF_01_WD=%p
+NF_02_LB=Сделать _объект
+NF_02_CM=make %e.o
+NF_02_WD=%p
+EX_00_LB=_Выполнить
+EX_00_CM=./%e
+EX_00_WD=%p
+CFT_00_LB=_Скомпилировать
+CFT_00_CM=gcc -Wall -c "%f"
+CFT_00_WD=%p
+CFT_01_LB=_Сборка
+CFT_01_CM=gcc -Wall -o "%e" "%f" -lhash
+CFT_01_WD=%p
+filetypes=C;