round seconds in command timing information if precision is >= 0; fix for readline word boundaries when quoted command substitutions appear; remove nameref attribute when converting nameref variable into an array; change how help strings are written to builtins.c; change read builtin to update unwind-protect if the input string is reallocated; fix crash when an expansion on the rhs of an assignment statement unsets the variable on the lhs

arrayfunc.c

@@ -203,7 +203,13 @@ make_array_variable_value (SHELL_VAR *entry, arrayind_t ind, const char *key, co
       dispose_variable (dentry);
     }
   else
-    newval = make_variable_value (entry, value, flags);
+    {
+      if (entry)
+	VSETATTR (entry, att_assigning);
+      newval = make_variable_value (entry, value, flags);
+      if (entry)
+	VUNSETATTR (entry, att_assigning);
+    }
 
   return newval;
 }
@@ -227,7 +233,7 @@ bind_assoc_var_internal (SHELL_VAR *entry, HASH_TABLE *hash, char *key, const ch
       (*entry->assign_func) (entry, newval, 0, key);
       FREE (key);
     }
-  else
+  else if (assoc_p (entry))
     assoc_insert (hash, key, newval);
 
   FREE (newval);
@@ -251,7 +257,7 @@ bind_array_var_internal (SHELL_VAR *entry, arrayind_t ind, char *key, const char
     (*entry->assign_func) (entry, newval, ind, key);
   else if (assoc_p (entry))
     assoc_insert (assoc_cell (entry), key, newval);
-  else
+  else if (array_p (entry))
     array_insert (array_cell (entry), ind, newval);
   FREE (newval);
 
@@ -432,7 +438,11 @@ assign_array_element_internal (SHELL_VAR *entry, const char *name, char *vname,
       int avflags;
 
       avflags = convert_assign_flags_to_arrayval_flags (flags);
+      if (entry)
+	VSETATTR (entry, att_assigning);
       ind = array_expand_index (entry, sub, sublen, avflags);
+      if (entry)
+	VUNSETATTR (entry, att_assigning);
       /* negative subscripts to indexed arrays count back from end */
       if (entry && ind < 0)
 	ind = (array_p (entry) ? array_max_index (array_cell (entry)) : 0) + 1 + ind;