--- a/ast.c	2020-02-03 17:32:44.302405596 +0300
+++ b/ast.c	2020-02-03 17:35:40.520962185 +0300
@@ -576,6 +576,7 @@
 			return;
 		}
 		assert(false);
+		return;
 	case MRSH_NODE_COMMAND:;
 		struct mrsh_command *cmd = mrsh_node_get_command(node);
 		switch (cmd->type) {
@@ -626,6 +627,7 @@
 			return;
 		}
 		assert(false);
+		return;
 	case MRSH_NODE_WORD:;
 		struct mrsh_word *word = mrsh_node_get_word(node);
 		switch (word->type) {
@@ -653,8 +655,10 @@
 			return;
 		}
 		assert(false);
+		return;
 	}
 	assert(false);
+	return;
 }
 
 static void position_next(struct mrsh_position *dst,
@@ -700,6 +704,7 @@
 		return;
 	case MRSH_WORD_ARITHMETIC:
 		assert(false); // TODO
+		return;
 	case MRSH_WORD_LIST:;
 		struct mrsh_word_list *wl = mrsh_word_get_list(word);
 		if (wl->children.len == 0) {
@@ -713,6 +718,7 @@
 		return;
 	}
 	assert(false);
+	return;
 }
 
 void mrsh_command_range(struct mrsh_command *cmd, struct mrsh_position *begin,
@@ -800,8 +806,10 @@
 			mrsh_command_get_function_definition(cmd);
 		*begin = fd->name_range.begin;
 		mrsh_command_range(fd->body, NULL, end);
+		return;
 	}
 	assert(false);
+	return;
 }
 
 static void buffer_append_str(struct mrsh_buffer *buf, const char *str) {
@@ -818,6 +826,7 @@
 	case MRSH_WORD_COMMAND:
 	case MRSH_WORD_ARITHMETIC:
 		assert(false);
+		return;
 	case MRSH_WORD_LIST:;
 		const struct mrsh_word_list *wl = mrsh_word_get_list(word);
 		for (size_t i = 0; i < wl->children.len; ++i) {
@@ -827,6 +836,7 @@
 		return;
 	}
 	assert(false);
+	return;
 }
 
 char *mrsh_word_str(const struct mrsh_word *word) {
@@ -891,6 +901,7 @@
 			return;
 		}
 		assert(false);
+		return;
 	case MRSH_NODE_COMMAND:;
 		struct mrsh_command *cmd = mrsh_node_get_command(node);
 		switch (cmd->type) {
@@ -956,6 +967,7 @@
 			return;
 		}
 		assert(false);
+		return;
 	case MRSH_NODE_WORD:;
 		// TODO: quoting
 		struct mrsh_word *word = mrsh_node_get_word(node);
@@ -1002,8 +1014,10 @@
 			return;
 		}
 		assert(false);
+		return;
 	}
 	assert(false);
+	return;
 }
 
 char *mrsh_node_format(struct mrsh_node *node) {
--- a/main.c	2020-02-03 18:40:40.433381483 +0300
+++ b/main.c	2020-02-03 18:39:57.708015856 +0300
@@ -14,7 +14,7 @@
 #include <unistd.h>
 #include "frontend.h"
 
-extern char **environ;
+// extern char **environ;
 
 int main(int argc, char *argv[]) {
 	struct mrsh_state *state = mrsh_state_create();