diff --git a/Makefile b/Makefile
index 88be435..ecf1a18 100644
--- a/Makefile
+++ b/Makefile
@@ -9,7 +9,7 @@ build:
 run: build
 	./php-parser $(PHPFILE)
 
-test: all
+test: build
 	go test ./... --cover
 
 compile: ./php5/php5.go ./php7/php7.go ./scanner/scanner.go
diff --git a/node/expr/assign_op/assign.go b/node/expr/assign_op/n_assign.go
similarity index 100%
rename from node/expr/assign_op/assign.go
rename to node/expr/assign_op/n_assign.go
diff --git a/node/expr/assign_op/assign_ref.go b/node/expr/assign_op/n_assign_ref.go
similarity index 100%
rename from node/expr/assign_op/assign_ref.go
rename to node/expr/assign_op/n_assign_ref.go
diff --git a/node/expr/assign_op/bitwise_and.go b/node/expr/assign_op/n_bitwise_and.go
similarity index 100%
rename from node/expr/assign_op/bitwise_and.go
rename to node/expr/assign_op/n_bitwise_and.go
diff --git a/node/expr/assign_op/bitwise_or.go b/node/expr/assign_op/n_bitwise_or.go
similarity index 100%
rename from node/expr/assign_op/bitwise_or.go
rename to node/expr/assign_op/n_bitwise_or.go
diff --git a/node/expr/assign_op/bitwise_xor.go b/node/expr/assign_op/n_bitwise_xor.go
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rename from node/expr/assign_op/bitwise_xor.go
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diff --git a/node/expr/assign_op/concat.go b/node/expr/assign_op/n_concat.go
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diff --git a/node/expr/assign_op/div.go b/node/expr/assign_op/n_div.go
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diff --git a/node/expr/assign_op/minus.go b/node/expr/assign_op/n_minus.go
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diff --git a/node/expr/assign_op/mod.go b/node/expr/assign_op/n_mod.go
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diff --git a/node/expr/assign_op/mul.go b/node/expr/assign_op/n_mul.go
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diff --git a/node/expr/assign_op/plus.go b/node/expr/assign_op/n_plus.go
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diff --git a/node/expr/assign_op/pow.go b/node/expr/assign_op/n_pow.go
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diff --git a/node/expr/assign_op/shift_left.go b/node/expr/assign_op/n_shift_left.go
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diff --git a/node/expr/assign_op/shift_right.go b/node/expr/assign_op/n_shift_right.go
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diff --git a/node/expr/binary_op/binary_op.go b/node/expr/binary_op/n_binary_op.go
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rename from node/expr/binary_op/binary_op.go
rename to node/expr/binary_op/n_binary_op.go
diff --git a/node/expr/binary_op/bitwise_and.go b/node/expr/binary_op/n_bitwise_and.go
similarity index 100%
rename from node/expr/binary_op/bitwise_and.go
rename to node/expr/binary_op/n_bitwise_and.go
diff --git a/node/expr/binary_op/bitwise_or.go b/node/expr/binary_op/n_bitwise_or.go
similarity index 100%
rename from node/expr/binary_op/bitwise_or.go
rename to node/expr/binary_op/n_bitwise_or.go
diff --git a/node/expr/binary_op/bitwise_xor.go b/node/expr/binary_op/n_bitwise_xor.go
similarity index 100%
rename from node/expr/binary_op/bitwise_xor.go
rename to node/expr/binary_op/n_bitwise_xor.go
diff --git a/node/expr/binary_op/boolean_and.go b/node/expr/binary_op/n_boolean_and.go
similarity index 100%
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diff --git a/node/expr/binary_op/boolean_or.go b/node/expr/binary_op/n_boolean_or.go
similarity index 100%
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diff --git a/node/expr/binary_op/coalesce.go b/node/expr/binary_op/n_coalesce.go
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rename to node/expr/binary_op/n_coalesce.go
diff --git a/node/expr/binary_op/concat.go b/node/expr/binary_op/n_concat.go
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diff --git a/node/expr/binary_op/div.go b/node/expr/binary_op/n_div.go
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diff --git a/node/expr/binary_op/equal.go b/node/expr/binary_op/n_equal.go
similarity index 100%
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diff --git a/node/expr/binary_op/greater.go b/node/expr/binary_op/n_greater.go
similarity index 100%
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diff --git a/node/expr/binary_op/greater_or_equal.go b/node/expr/binary_op/n_greater_or_equal.go
similarity index 100%
rename from node/expr/binary_op/greater_or_equal.go
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diff --git a/node/expr/binary_op/identical.go b/node/expr/binary_op/n_identical.go
similarity index 100%
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diff --git a/node/expr/binary_op/logical_and.go b/node/expr/binary_op/n_logical_and.go
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diff --git a/node/expr/binary_op/logical_or.go b/node/expr/binary_op/n_logical_or.go
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diff --git a/node/expr/binary_op/logical_xor.go b/node/expr/binary_op/n_logical_xor.go
similarity index 100%
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diff --git a/node/expr/binary_op/minus.go b/node/expr/binary_op/n_minus.go
similarity index 100%
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diff --git a/node/expr/binary_op/mod.go b/node/expr/binary_op/n_mod.go
similarity index 100%
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diff --git a/node/expr/binary_op/mul.go b/node/expr/binary_op/n_mul.go
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diff --git a/node/expr/binary_op/not_equal.go b/node/expr/binary_op/n_not_equal.go
similarity index 100%
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diff --git a/node/expr/binary_op/not_identical.go b/node/expr/binary_op/n_not_identical.go
similarity index 100%
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diff --git a/node/expr/binary_op/plus.go b/node/expr/binary_op/n_plus.go
similarity index 100%
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diff --git a/node/expr/binary_op/pow.go b/node/expr/binary_op/n_pow.go
similarity index 100%
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diff --git a/node/expr/binary_op/shift_left.go b/node/expr/binary_op/n_shift_left.go
similarity index 100%
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diff --git a/node/expr/binary_op/shift_right.go b/node/expr/binary_op/n_shift_right.go
similarity index 100%
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diff --git a/node/expr/binary_op/smaller.go b/node/expr/binary_op/n_smaller.go
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diff --git a/node/expr/binary_op/spaceship.go b/node/expr/binary_op/n_spaceship.go
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