I am getting a compiler error that I completely don't understand. I literally copied the piece of example code from the documentation, and made some simple changes, but the compiler does not like it and is giving me an error that I just don't understand, what it seems to what makes no sense and when I give in and put what it is looking for it just generates a different error.

Here is the code fragment:

pub struct ChartDisplay<Inst: std::marker::Copy + 'static> {
    lheight: f64,
    topofcabs: f64,
    cabheight: f64,
    bottomofcabs: f64,
    numberofcabs: usize,
    cabarray: HashMap<String,f64>,
    topofchart: f64,
    chartheight: f64,
    bottomofchart: f64,
    totallength: f64,
    chartstationoffset: f64,
    topofstorage: f64,
    storagetrackheight: f64,
    bottomofstorage: f64,
    numberofstoragetracks: usize,
    storageoffset: f64,
    stationarray: HashMap<String,f64>, 
    storagearray: HashMap<String,f64>,

    timescale: u32,
    timeinterval: u32,
    labelsize: u32,

    hull: TkCanvas<Inst>,
    
}

impl<TkCanvas<Inst>> Deref for ChartDisplay<Inst> {
    type Target = TkCanvas<Inst>;

    fn deref(&self) -> &Self::Target {
        &self.hull
    }
}

and here is the error message:

   Compiling time_table_gui v0.1.0 (/home/heller/RustProjects/time_table_gui)
error: expected `::`, found `Deref`
  --> src/ttmainwindow.rs:76:22
   |
76 | impl<TkCanvas<Inst>> Deref for ChartDisplay<Inst> {
   |                      ^^^^^ expected `::`

error: could not compile `time_table_gui` (bin "time_table_gui") due to 1 previous error

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