Method active_var_def_offset

src/symbol_map/mod.rs:674–679

Return the `effective_from` offset of the most recent definition of `$var_name` that is visible at `cursor_offset`, or `0` if no definition is found. This is used as a cache-key discriminator: two accesses to the same variable that fall under the same definition share a cache entry, but accesses before vs. after a reassignment get different entries.

(&self, var_name: &str, cursor_offset: u32)

    /// entry, but accesses before vs. after a reassignment get different
    /// entries.
    pub fn active_var_def_offset(&self, var_name: &str, cursor_offset: u32) -> u32 {
        let scope_start = self.find_enclosing_scope(cursor_offset);
        self.find_var_definition(var_name, cursor_offset, scope_start)
            .map(|d| d.effective_from)
            .unwrap_or(0)
    }

    /// Check whether `cursor_offset` is physically sitting on a variable
    /// definition token (the `$var` token of an assignment LHS, parameter,