postprocessing: do quote removal

test.sh

@@ -291,6 +291,25 @@ expecting <<EOF
      ╰─ (no redirections)
 EOF
 
+when_run <<EOF "quotes are removed"
+echo "this contains quotes"
+EOF
+expecting <<EOF
+ ╰─ t_cmdgroup
+     ├─ t_cmdlist
+     │   ├─ num_cmds = 1
+     │   ╰─ cmd[0]
+     │       ├─ t_cmdlist_item
+     │       │   ╰─ t_pipeline
+     │       │       ├─ num_cmd = 1
+     │       │       ╰─ cmd[0]
+     │       │           ╰─ t_simple_cmd
+     │       │               ├─ words = [echo][this contains quotes]
+     │       │               ╰─ (no redirections)
+     │       ╰─ t_operator = END
+     ╰─ (no redirections)
+EOF
+
 when_run <<EOF "quoted parentheses are not operators"
 echo unclosed '('
 EOF