optional record fields in patterns are bound

compiler/can/src/pattern.rs

@@ -326,6 +326,9 @@ pub fn canonicalize_pattern<'a>(
                                     &loc_default.value,
                                 );
 
+                                // an optional field binds the symbol!
+                                output.references.bound_symbols.insert(symbol);
+
                                 output.union(expr_output);
 
                                 destructs.push(Located {

compiler/solve/src/solve.rs

@@ -201,8 +201,8 @@ fn solve(
     constraint: &Constraint,
 ) -> State {
     match constraint {
-        // True =>  state,
         True => {
+            dbg!(&env.vars_by_symbol);
             state
                 .vars_by_symbol
                 .extend(env.vars_by_symbol.iter().map(|(x, y)| (*x, *y)));