fix: make code in Cookbook compile (#339)

pages/cookbook/data-structures.mdx

@@ -18,9 +18,9 @@ Following example emulates an array using a [`map<Int, V>{:tact}`][map] wrapped
 import "@stdlib/deploy"; // for Deployable trait
 
 struct Array {
-    map: map<Int as uint16, Int>; // array of Int values as a map of Ints to Ints,
-                                  // with serialization of its keys to uint16 to save space
-    length: Int = 0;              // length of the array, defaults to 0
+    m: map<Int as uint16, Int>; // array of Int values as a map of Ints to Ints,
+                                // with serialization of its keys to uint16 to save space
+    length: Int = 0;            // length of the array, defaults to 0
 }
 
 // Compile-time constant upper bound for our map representing an array.
@@ -114,7 +114,7 @@ extends mutates fun deleteAll(self: Array) {
 
 // Global static function for creating an empty Array
 fun emptyArray(): Array {
-    return Array{map: emptyMap()}; // length defaults to 0
+    return Array{m: emptyMap(), length: 0}; // length defaults to 0
 }
 
 // Contract, with emulating an Array using the map
@@ -171,9 +171,9 @@ Following example emulates a stack using a [`map<Int, V>{:tact}`][map] wrapped i
 import "@stdlib/deploy"; // for Deployable trait
 
 struct Stack {
-    map: map<Int as uint16, Int>; // stack of Int values as a map of Ints to Ints,
-                                  // with serialization of its keys to uint16 to save space
-    length: Int = 0;              // length of the stack, defaults to 0
+    m: map<Int as uint16, Int>; // stack of Int values as a map of Ints to Ints,
+                                // with serialization of its keys to uint16 to save space
+    length: Int = 0;            // length of the stack, defaults to 0
 }
 
 // Compile-time constant upper bound for our map representing an stack.
@@ -215,7 +215,7 @@ extends mutates fun deleteAll(self: Stack) {
 
 // Global static function for creating an empty Stack
 fun emptyStack(): Stack {
-    return Stack{map: emptyMap()}; // length defaults to 0
+    return Stack{m: emptyMap(), length: 0}; // length defaults to 0
 }
 
 contract MapAsStack with Deployable {
@@ -272,10 +272,10 @@ Following example emulates a circular buffer using a [`map<Int, V>{:tact}`][map]
 import "@stdlib/deploy"; // for Deployable trait
 
 struct CircularBuffer {
-    map: map<Int as uint8, Int>; // circular buffer of Int values as a map of Ints to Ints,
-                                 // with serialization of its keys to uint8 to save space
-    length: Int = 0;             // length of the circular buffer, defaults to 0
-    start: Int = 0;              // current index into the circular buffer, defaults to 0
+    m: map<Int as uint8, Int>; // circular buffer of Int values as a map of Ints to Ints,
+                               // with serialization of its keys to uint8 to save space
+    length: Int = 0;           // length of the circular buffer, defaults to 0
+    start: Int = 0;            // current index into the circular buffer, defaults to 0
 }
 
 // Compile-time constant upper bound for our map representing a circular buffer.
@@ -324,7 +324,7 @@ extends mutates fun deleteAll(self: CircularBuffer) {
 
 // Global static function for creating an empty CircularBuffer
 fun emptyCircularBuffer(): CircularBuffer {
-    return CircularBuffer{map: emptyMap()}; // length and start default to 0
+    return CircularBuffer{m: emptyMap(), length: 0, start: 0}; // length and start default to 0
 }
 
 // This contract records the last 5 timestamps of when "timer" message was received