\- ()
  \- `{
  \- ()
    \- `<-
    \- `f
    \- ()
      \- `function
      \- []
        \ t =`MISSING
        \ c =`MISSING
      \- ()
        \- `+
        \- ()
          \- `sin
          \- `t
        \- ()
          \- `*
          \- `c
          \- ()
            \- `cos
            \- `t
      \- <srcref>
  \- ()
    \- `<-
    \- `ts
    \- ()
      \- `seq
      \- ()
        \- `-
        \- `pi
      \- `pi
      \-  0.01
  \- ()
    \- `for
    \- `c
    \- ()
      \- `seq
      \-  0
      \-  1
      \-  0.1
    \- ()
      \- `{
      \- ()
        \- `plot
        \- `ts
        \- ()
          \- `f
          \- `ts
          \- `c
        \-  "l"
        \- ()
          \- `c
          \- ()
            \- `-
            \- `pi
          \- `pi
        \- ()
          \- `c
          \- ()
            \- `-
            \-  1.5
          \-  1.5
  \-  1 
NULL
\- ()
  \- `function
  \- []
    \ x =`MISSING
  \- ()
    \- `{
    \- ()
      \- `^
      \- `x
      \-  2
  \- <srcref> 
NULL
 [1] "\\- ()"                 "  \\- `{"               "  \\- ()"              
 [4] "    \\- `<-"            "    \\- `f"             "    \\- ()"            
 [7] "      \\- `function"    "      \\- []"           "        \\ t =`MISSING"
[10] "        \\ c =`MISSING" "      \\- ()"           "        \\- `+"        
[13] "        \\- ()"         "          \\- `sin"     "          \\- `t"      
[16] "        \\- ()"         "          \\- `*"       "          \\- `c"      
[19] "          \\- ()"       "            \\- `cos"   "            \\- `t"    
[22] "      \\- <srcref>"     "  \\- ()"               "    \\- `<-"           
[25] "    \\- `ts"            "    \\- ()"             "      \\- `seq"        
[28] "      \\- ()"           "        \\- `-"         "        \\- `pi"       
[31] "      \\- `pi"          "      \\-  0.01"        "  \\- ()"              
[34] "    \\- `for"           "    \\- `c"             "    \\- ()"            
[37] "      \\- `seq"         "      \\-  0"           "      \\-  1"          
[40] "      \\-  0.1"         "    \\- ()"             "      \\- `{"          
[43] "      \\- ()"           "        \\- `plot"      "        \\- `ts"       
[46] "        \\- ()"         "          \\- `f"       "          \\- `ts"     
[49] "          \\- `c"       "        \\-  \"l\""     "        \\- ()"        
[52] "          \\- `c"       "          \\- ()"       "            \\- `-"    
[55] "            \\- `pi"    "          \\- `pi"      "        \\- ()"        
[58] "          \\- `c"       "          \\- ()"       "            \\- `-"    
[61] "            \\-  1.5"   "          \\-  1.5"     "  \\-  1 "             
 [1] "\\- ()"             "  \\- `function"    "  \\- []"          
 [4] "    \\ x =`MISSING" "  \\- ()"           "    \\- `{"        
 [7] "    \\- ()"         "      \\- `^"       "      \\- `x"      
[10] "      \\-  2"       "  \\- <srcref> "   

