Fix missing autolet inner declaration block (#105)

Author: IamIpanda

source/parser.hera

@@ -5887,6 +5887,7 @@ Init
           }
         }
         else if (node.type == "Declaration") {
+            if (node.children && node.children.length) createLetDecs(node.children, scopes)
             node.names.forEach((name) => currentScope.add(name))
         }
         else {

test/autolet.civet

@@ -31,6 +31,7 @@ describe "auto let", ->
     """
 
 describe "auto let with function", ->
+    // TODO: We should fix the return let here, this is invalid.
     testCase """
         auto let with function
         ---
@@ -41,13 +42,19 @@ describe "auto let with function", ->
             var b = 2
         }
         a = 2
+        let c = (b) => {
+            c = 1
+        }
         ---
         let b = 1
         function b(a) {
             a = 1
             var b = 2
         }
         let a = 2
+        let c = (b) => {
+            return let c = 1
+        }
     """
 
 describe "auto let with multiple declaration", ->