Do not allow use of block-scoped variable before its definition

tests/baselines/reference/constDeclarations-useBeforeDefinition.errors.txt

@@ -0,0 +1,21 @@
+tests/cases/compiler/constDeclarations-useBeforeDefinition.ts(3,5): error TS2448: Block-scoped variable 'c1' used before its declaration.
+tests/cases/compiler/constDeclarations-useBeforeDefinition.ts(9,5): error TS2448: Block-scoped variable 'v1' used before its declaration.
+
+
+==== tests/cases/compiler/constDeclarations-useBeforeDefinition.ts (2 errors) ====
+    
+    {
+        c1;
+        ~~
+!!! error TS2448: Block-scoped variable 'c1' used before its declaration.
+        const c1 = 0;
+    }
+    
+    var v1;
+    {
+        v1;
+        ~~
+!!! error TS2448: Block-scoped variable 'v1' used before its declaration.
+        const v1 = 0;
+    }
+    

tests/baselines/reference/constDeclarations-useBeforeDefinition.js

@@ -0,0 +1,24 @@
+//// [constDeclarations-useBeforeDefinition.ts]
+
+{
+    c1;
+    const c1 = 0;
+}
+
+var v1;
+{
+    v1;
+    const v1 = 0;
+}
+
+
+//// [constDeclarations-useBeforeDefinition.js]
+{
+    c1;
+    const c1 = 0;
+}
+var v1;
+{
+    v1;
+    const v1 = 0;
+}

tests/baselines/reference/constDeclarations-useBeforeDefinition2.errors.txt

@@ -0,0 +1,11 @@
+tests/cases/compiler/file1.ts(2,1): error TS2448: Block-scoped variable 'c' used before its declaration.
+
+
+==== tests/cases/compiler/file1.ts (1 errors) ====
+    
+    c;
+    ~
+!!! error TS2448: Block-scoped variable 'c' used before its declaration.
+    
+==== tests/cases/compiler/file2.ts (0 errors) ====
+    const c = 0;

tests/baselines/reference/constDeclarations-useBeforeDefinition2.js

@@ -0,0 +1,12 @@
+//// [tests/cases/compiler/constDeclarations-useBeforeDefinition2.ts] ////
+
+//// [file1.ts]
+
+c;
+
+//// [file2.ts]
+const c = 0;
+
+//// [out.js]
+c;
+const c = 0;

tests/baselines/reference/letDeclarations-useBeforeDefinition.errors.txt

@@ -0,0 +1,21 @@
+tests/cases/compiler/letDeclarations-useBeforeDefinition.ts(3,5): error TS2448: Block-scoped variable 'l1' used before its declaration.
+tests/cases/compiler/letDeclarations-useBeforeDefinition.ts(9,5): error TS2448: Block-scoped variable 'v1' used before its declaration.
+
+
+==== tests/cases/compiler/letDeclarations-useBeforeDefinition.ts (2 errors) ====
+    
+    {
+        l1;
+        ~~
+!!! error TS2448: Block-scoped variable 'l1' used before its declaration.
+        let l1;
+    }
+    
+    var v1;
+    {
+        v1;
+        ~~
+!!! error TS2448: Block-scoped variable 'v1' used before its declaration.
+        let v1 = 0;
+    }
+    

tests/baselines/reference/letDeclarations-useBeforeDefinition.js

@@ -0,0 +1,24 @@
+//// [letDeclarations-useBeforeDefinition.ts]
+
+{
+    l1;
+    let l1;
+}
+
+var v1;
+{
+    v1;
+    let v1 = 0;
+}
+
+
+//// [letDeclarations-useBeforeDefinition.js]
+{
+    l1;
+    let l1;
+}
+var v1;
+{
+    v1;
+    let v1 = 0;
+}

tests/baselines/reference/letDeclarations-useBeforeDefinition2.errors.txt

@@ -0,0 +1,11 @@
+tests/cases/compiler/file1.ts(2,1): error TS2448: Block-scoped variable 'l' used before its declaration.
+
+
+==== tests/cases/compiler/file1.ts (1 errors) ====
+    
+    l;
+    ~
+!!! error TS2448: Block-scoped variable 'l' used before its declaration.
+    
+==== tests/cases/compiler/file2.ts (0 errors) ====
+    const l = 0;

tests/baselines/reference/letDeclarations-useBeforeDefinition2.js

@@ -0,0 +1,12 @@
+//// [tests/cases/compiler/letDeclarations-useBeforeDefinition2.ts] ////
+
+//// [file1.ts]
+
+l;
+
+//// [file2.ts]
+const l = 0;
+
+//// [out.js]
+l;
+const l = 0;

tests/baselines/reference/letDeclarations3.errors.txt

@@ -0,0 +1,18 @@
+tests/cases/compiler/letDeclarations3.ts(3,5): error TS2300: Duplicate identifier 'l1'.
+tests/cases/compiler/letDeclarations3.ts(3,9): error TS2300: Duplicate identifier 'l1'.
+tests/cases/compiler/letDeclarations3.ts(3,13): error TS2300: Duplicate identifier 'l1'.
+
+
+==== tests/cases/compiler/letDeclarations3.ts (3 errors) ====
+    
+    // Duplicate variables
+    let l1, l1, l1;
+        ~~
+!!! error TS2300: Duplicate identifier 'l1'.
+            ~~
+!!! error TS2300: Duplicate identifier 'l1'.
+                ~~
+!!! error TS2300: Duplicate identifier 'l1'.
+    
+    // unexpected 'let'
+    let l2, let, l3;

tests/cases/compiler/constDeclarations-useBeforeDefinition.ts

@@ -0,0 +1,12 @@
+// @target: ES6
+
+{
+    c1;
+    const c1 = 0;
+}
+
+var v1;
+{
+    v1;
+    const v1 = 0;
+}

tests/cases/compiler/constDeclarations-useBeforeDefinition2.ts

@@ -0,0 +1,8 @@
+// @target: ES6
+// @out: out.js
+
+// @Filename: file1.ts
+c;
+
+// @Filename: file2.ts
+const c = 0;

tests/cases/compiler/letDeclarations-useBeforeDefinition.ts

@@ -0,0 +1,12 @@
+// @target: ES6
+
+{
+    l1;
+    let l1;
+}
+
+var v1;
+{
+    v1;
+    let v1 = 0;
+}

tests/cases/compiler/letDeclarations-useBeforeDefinition2.ts

@@ -0,0 +1,8 @@
+// @target: ES6
+// @out: out.js
+
+// @Filename: file1.ts
+l;
+
+// @Filename: file2.ts
+const l = 0;