fix warnings

tools/edit_fallback.hh

@@ -10,7 +10,7 @@ inline void init_lineedit(cs_state &, ostd::string_range) {
 
 inline std::optional<std::string> read_line(cs_state &, cs_svar *pr) {
     ostd::write(pr->get_value());
-    return std::move(ostd::cin.get_line(ostd::appender<std::string>()).get());
+    return ostd::cin.get_line(ostd::appender<std::string>()).get();
 }
 
 inline void add_history(cs_state &, ostd::string_range) {

tools/edit_linenoise.hh

@@ -72,7 +72,7 @@ inline std::optional<std::string> read_line(cs_state &, cs_svar *pr) {
     }
     std::string ret = line;
     linenoiseFree(line);
-    return std::move(ret);
+    return ret;
 }
 
 inline void add_history(cs_state &, ostd::string_range line) {

tools/edit_readline.hh

@@ -76,7 +76,7 @@ inline std::optional<std::string> read_line(cs_state &, cs_svar *pr) {
     }
     std::string ret = line;
     free(line);
-    return std::move(ret);
+    return ret;
 }
 
 inline void add_history(cs_state &, ostd::string_range line) {

tools/linenoise.cc

@@ -350,7 +350,7 @@ static void freeCompletions(linenoiseCompletions *lc) {
 static int completeLine(struct linenoiseState *ls) {
     linenoiseCompletions lc = { 0, NULL };
     int nread, nwritten;
-    char c = 0;
+    signed char c = 0;
 
     completionCallback(ls->buf,&lc);
     if (lc.len == 0) {
@@ -793,9 +793,9 @@ static int linenoiseEdit(int stdin_fd, int stdout_fd, char *buf, size_t buflen,
 
     if (write(l.ofd,prompt,l.plen) == -1) return -1;
     while(1) {
-        char c;
+        signed char c;
         int nread;
-        char seq[3];
+        signed char seq[3];
 
         nread = read(l.ifd,&c,1);
         if (nread <= 0) return l.len;

tools/repl.cc

@@ -371,7 +371,7 @@ endargs:
             return 0;
         } else {
             std::string str;
-            for (char c = '\0'; (c = ostd::cin.get_char()) != EOF;) {
+            for (signed char c = '\0'; (c = ostd::cin.get_char()) != EOF;) {
                 str += c;
             }
             do_call(gcs, str);