Add print and format examples

packages/valkyrie-esoteric/source/statement/let-statement.valkyrie

@@ -1,3 +1,28 @@
+let mut, `let`;
+let mut a, ref b;
+let mut a, ref b: i32, &i32;
+⍝ test keywords
+let `let` `let`: `let` = 1
+let mut mut: mut = 1
+⍝ test tuple
+let mut `let`, mut = (1, 2);
+let mut (`let`, mut) = (1, 2)
+let (mut `let`, mut) = (1, 2)
+⍝ test slice
+let mut `let`, ..mut = [1, 2];
+let mut [`let`, ...mut] = [1, 2]
+let [mut `let`, ...mut] = [1, 2]
+⍝ test dict
+let mut {`let`, ..mut} = 0;
+let mut {`let`: mut, ..mut} = 0;
+let {mut `let`: `let`, mut ..mut} = 0;
+⍝ test case match
+let case (mut a, b) = (1, 2)
+let case mut (a, b) = (1, 2)
+let case Fraction(mut a, b) = Fraction(1, 2)
+let case mut Fraction(a, b) = Fraction(1, 2)
+
+
 ⍝ let pattern
 let x = expression();
 let x, y = expression();