Merge pull request #475 from bocoup/completion-reform

Tests for ES2015/2016 Completion Reform

test/language/statements/do-while/cptn-abrupt-empty.js

+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.7.2.6
+description: >
+    Completion value when iteration completes due to an empty abrupt completion
+info: >
+    IterationStatement : do Statement while ( Expression ) ;
+
+    1. Let V = undefined.
+    2. Repeat
+       a. Let stmt be the result of evaluating Statement.
+       b. If LoopContinues(stmt, labelSet) is false, return
+          Completion(UpdateEmpty(stmt, V)).
+---*/
+
+assert.sameValue(eval('1; do { break; } while (false)'), undefined);
+assert.sameValue(eval('2; do { 3; break; } while (false)'), 3);
+
+assert.sameValue(eval('4; do { continue; } while (false)'), undefined);
+assert.sameValue(eval('5; do { 6; continue; } while (false)'), 6);

test/language/statements/do-while/cptn-normal.js

+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.7.2.6
+description: >
+    Completion value when iteration completes due to expression value
+info: >
+    IterationStatement : do Statement while ( Expression ) ;
+
+    1. Let V = undefined.
+    2. Repeat
+       a. Let stmt be the result of evaluating Statement.
+       b. If LoopContinues(stmt, labelSet) is false, return
+          Completion(UpdateEmpty(stmt, V)).
+       c. If stmt.[[value]] is not empty, let V = stmt.[[value]].
+       d. Let exprRef be the result of evaluating Expression.
+       e. Let exprValue be GetValue(exprRef).
+       f. ReturnIfAbrupt(exprValue).
+       g. If ToBoolean(exprValue) is false, return NormalCompletion(V).
+---*/
+
+assert.sameValue(eval('1; do { } while (false)'), undefined);
+assert.sameValue(eval('2; do { 3; } while (false)'), 3);

test/language/statements/for-in/cptn-decl-abrupt-empty.js

+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.7.5.11
+description: >
+    Completion value when head has a declaration and iteration is cancelled
+info: >
+    IterationStatement : for ( var ForBinding in Expression ) Statement
+
+    1. Let keyResult be ForIn/OfHeadEvaluation( « », Expression, enumerate).
+    2. ReturnIfAbrupt(keyResult).
+    3. Return ForIn/OfBodyEvaluation(ForBinding, Statement, keyResult,
+       varBinding, labelSet).
+
+    13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation
+
+    [...]
+    2. Let V = undefined.
+    [...]
+    5. Repeat
+       a. Let nextResult be IteratorStep(iterator).
+       b. ReturnIfAbrupt(nextResult).
+       c. If nextResult is false, return NormalCompletion(V).
+       [...]
+       k. Let result be the result of evaluating stmt.
+       [...]
+       m. If LoopContinues(result, labelSet) is false, return
+          IteratorClose(iterator, UpdateEmpty(result, V)).
+---*/
+
+assert.sameValue(eval('1; for (var a in { x: 0 }) { break; }'), undefined);
+assert.sameValue(eval('2; for (var b in { x: 0 }) { 3; break; }'), 3);
+
+assert.sameValue(
+  eval('4; outer: do { for (var a in { x: 0 }) { continue outer; } } while (false)'),
+  undefined
+);
+assert.sameValue(
+  eval('5; outer: do { for (var b in { x: 0 }) { 6; continue outer; } } while (false)'),
+  6
+);

test/language/statements/for-in/cptn-decl-itr.js

+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.7.5.11
+description: >
+    Completion value when head has a declaration and iteration occurs
+info: >
+    IterationStatement : for ( var ForBinding in Expression ) Statement
+
+    1. Let keyResult be ForIn/OfHeadEvaluation( « », Expression, enumerate).
+    2. ReturnIfAbrupt(keyResult).
+    3. Return ForIn/OfBodyEvaluation(ForBinding, Statement, keyResult,
+       varBinding, labelSet).
+
+    13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation
+
+    [...]
+    2. Let V = undefined.
+    [...]
+    5. Repeat
+       a. Let nextResult be IteratorStep(iterator).
+       b. ReturnIfAbrupt(nextResult).
+       c. If nextResult is false, return NormalCompletion(V).
+       [...]
+       k. Let result be the result of evaluating stmt.
+       [...]
+       n. If result.[[value]] is not empty, let V be result.[[value]].
+---*/
+
+assert.sameValue(eval('1; for (var a in { x: 0 }) { }'), undefined);
+assert.sameValue(eval('2; for (var b in { x: 0 }) { 3; }'), 3);

test/language/statements/for-in/cptn-decl-skip-itr.js

+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.7.5.11
+description: >
+    Completion value when head has a declaration and iteration is skipped
+info: >
+    IterationStatement : for ( var ForBinding in Expression ) Statement
+
+    1. Let keyResult be ForIn/OfHeadEvaluation( « », Expression, enumerate).
+    2. ReturnIfAbrupt(keyResult).
+
+    13.7.5.12 Runtime Semantics: ForIn/OfHeadEvaluation
+
+    [...]
+    7. If iterationKind is enumerate, then
+       a. If exprValue.[[value]] is null or undefined, then
+          i. Return Completion{[[type]]: break, [[value]]: empty, [[target]]:
+             empty}.
+---*/
+
+assert.sameValue(eval('1; for (var a in undefined) { }'), undefined);
+assert.sameValue(eval('2; for (var b in undefined) { 3; }'), undefined);
+assert.sameValue(eval('4; for (var c in null) { }'), undefined);
+assert.sameValue(eval('5; for (var d in null) { 6; }'), undefined);

test/language/statements/for-in/cptn-decl-zero-itr.js

+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.7.5.11
+description: >
+    Completion value when head has a declaration and no iteration occurs
+info: >
+    IterationStatement : for ( var ForBinding in Expression ) Statement
+
+    1. Let keyResult be ForIn/OfHeadEvaluation( « », Expression, enumerate).
+    2. ReturnIfAbrupt(keyResult).
+    3. Return ForIn/OfBodyEvaluation(ForBinding, Statement, keyResult,
+       varBinding, labelSet).
+
+    13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation
+
+    [...]
+    2. Let V = undefined.
+    [...]
+    5. Repeat
+       a. Let nextResult be IteratorStep(iterator).
+       b. ReturnIfAbrupt(nextResult).
+       c. If nextResult is false, return NormalCompletion(V).
+---*/
+
+assert.sameValue(eval('1; for (var a in {}) { }'), undefined);
+assert.sameValue(eval('2; for (var b in {}) { 3; }'), undefined);

test/language/statements/for-in/cptn-expr-abrupt-empty.js

+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.7.5.11
+description: >
+    Completion value when head has no declaration and iteration is cancelled
+info: >
+    IterationStatement : for ( LeftHandSideExpression in Expression ) Statement
+
+    1. Let keyResult be ForIn/OfHeadEvaluation( « », Expression, enumerate).
+    2. ReturnIfAbrupt(keyResult).
+    3. Return ForIn/OfBodyEvaluation(LeftHandSideExpression, Statement,
+       keyResult, assignment, labelSet).
+
+    13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation
+
+    [...]
+    2. Let V = undefined.
+    [...]
+    5. Repeat
+       a. Let nextResult be IteratorStep(iterator).
+       b. ReturnIfAbrupt(nextResult).
+       c. If nextResult is false, return NormalCompletion(V).
+       [...]
+       k. Let result be the result of evaluating stmt.
+       [...]
+       m. If LoopContinues(result, labelSet) is false, return
+          IteratorClose(iterator, UpdateEmpty(result, V)).
+---*/
+
+assert.sameValue(eval('var a; 1; for (a in { x: 0 }) { break; }'), undefined);
+assert.sameValue(eval('var b; 2; for (b in { x: 0 }) { 3; break; }'), 3);
+
+assert.sameValue(
+  eval('var a; 4; outer: do { for (a in { x: 0 }) { continue outer; } } while (false)'),
+  undefined
+);
+assert.sameValue(
+  eval('var b; 5; outer: do { for (b in { x: 0 }) { 6; continue outer; } } while (false)'),
+  6
+);

test/language/statements/for-in/cptn-expr-itr.js

+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.7.5.11
+description: >
+    Completion value when head has no declaration and iteration occurs
+info: >
+    IterationStatement : for ( LeftHandSideExpression in Expression ) Statement
+
+    1. Let keyResult be ForIn/OfHeadEvaluation( « », Expression, enumerate).
+    2. ReturnIfAbrupt(keyResult).
+    3. Return ForIn/OfBodyEvaluation(LeftHandSideExpression, Statement,
+       keyResult, assignment, labelSet).
+
+    13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation
+
+    [...]
+    2. Let V = undefined.
+    [...]
+    5. Repeat
+       a. Let nextResult be IteratorStep(iterator).
+       b. ReturnIfAbrupt(nextResult).
+       c. If nextResult is false, return NormalCompletion(V).
+       [...]
+       k. Let result be the result of evaluating stmt.
+       [...]
+       n. If result.[[value]] is not empty, let V be result.[[value]].
+---*/
+
+assert.sameValue(eval('var a; 1; for (a in { x: 0 }) { }'), undefined);
+assert.sameValue(eval('var b; 2; for (b in { x: 0 }) { 3; }'), 3);

test/language/statements/for-in/cptn-expr-skip-itr.js

+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.7.5.11
+description: >
+    Completion value when head has no declaration and iteration is skipped
+info: >
+    IterationStatement : for ( LeftHandSideExpression in Expression ) Statement
+
+    1. Let keyResult be ForIn/OfHeadEvaluation( « », Expression, enumerate).
+    2. ReturnIfAbrupt(keyResult).
+
+    13.7.5.12 Runtime Semantics: ForIn/OfHeadEvaluation
+
+    [...]
+    7. If iterationKind is enumerate, then
+       a. If exprValue.[[value]] is null or undefined, then
+          i. Return Completion{[[type]]: break, [[value]]: empty, [[target]]:
+             empty}.
+---*/
+
+assert.sameValue(eval('var a; 1; for (a in undefined) { }'), undefined);
+assert.sameValue(eval('var b; 2; for (b in undefined) { 3; }'), undefined);
+assert.sameValue(eval('var c; 4; for (c in null) { }'), undefined);
+assert.sameValue(eval('var d; 5; for (d in null) { 6; }'), undefined);

test/language/statements/for-in/cptn-expr-zero-itr.js

+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.7.5.11
+description: >
+    Completion value when head has no declaration and no iteration occurs
+info: >
+    IterationStatement : for ( LeftHandSideExpression in Expression ) Statement
+
+    1. Let keyResult be ForIn/OfHeadEvaluation( « », Expression, enumerate).
+    2. ReturnIfAbrupt(keyResult).
+    3. Return ForIn/OfBodyEvaluation(LeftHandSideExpression, Statement,
+       keyResult, assignment, labelSet).
+
+    13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation
+
+    [...]
+    2. Let V = undefined.
+    [...]
+    5. Repeat
+       a. Let nextResult be IteratorStep(iterator).
+       b. ReturnIfAbrupt(nextResult).
+       c. If nextResult is false, return NormalCompletion(V).
+---*/
+
+assert.sameValue(eval('var a; 1; for (a in {}) { }'), undefined);
+assert.sameValue(eval('var b; 2; for (b in {}) { 3; }'), undefined);

test/language/statements/for-of/cptn-decl-abrupt-empty.js

+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.7.5.11
+description: >
+    Completion value when head has a declaration and iteration is cancelled
+info: >
+    IterationStatement : for ( var ForBinding of AssignmentExpression ) Statement
+
+    1. Let keyResult be the result of performing ForIn/OfHeadEvaluation( « »,
+       AssignmentExpression, iterate).
+    2. ReturnIfAbrupt(keyResult).
+    3. Return ForIn/OfBodyEvaluation(ForBinding, Statement, keyResult,
+       varBinding, labelSet).
+
+    13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation
+
+    [...]
+    2. Let V = undefined.
+    [...]
+    5. Repeat
+       a. Let nextResult be IteratorStep(iterator).
+       b. ReturnIfAbrupt(nextResult).
+       c. If nextResult is false, return NormalCompletion(V).
+       [...]
+       k. Let result be the result of evaluating stmt.
+       [...]
+       m. If LoopContinues(result, labelSet) is false, return
+          IteratorClose(iterator, UpdateEmpty(result, V)).
+---*/
+
+assert.sameValue(eval('1; for (var a of [0]) { break; }'), undefined);
+assert.sameValue(eval('2; for (var b of [0]) { 3; break; }'), 3);
+
+assert.sameValue(
+  eval('4; outer: do { for (var a of [0]) { continue outer; } } while (false)'),
+  undefined
+);
+assert.sameValue(
+  eval('5; outer: do { for (var b of [0]) { 6; continue outer; } } while (false)'),
+  6
+);

test/language/statements/for-of/cptn-decl-itr.js

+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.7.5.11
+description: >
+    Completion value when head has a declaration and iteration occurs
+info: >
+    IterationStatement : for ( var ForBinding of AssignmentExpression ) Statement
+
+    1. Let keyResult be the result of performing ForIn/OfHeadEvaluation( « »,
+       AssignmentExpression, iterate).
+    2. ReturnIfAbrupt(keyResult).
+    3. Return ForIn/OfBodyEvaluation(ForBinding, Statement, keyResult,
+       varBinding, labelSet).
+
+    13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation
+
+    [...]
+    2. Let V = undefined.
+    [...]
+    5. Repeat
+       a. Let nextResult be IteratorStep(iterator).
+       b. ReturnIfAbrupt(nextResult).
+       c. If nextResult is false, return NormalCompletion(V).
+       [...]
+       k. Let result be the result of evaluating stmt.
+       [...]
+       n. If result.[[value]] is not empty, let V be result.[[value]].
+---*/
+
+assert.sameValue(eval('1; for (var a of [0]) { }'), undefined);
+assert.sameValue(eval('2; for (var b of [0]) { 3; }'), 3);

test/language/statements/for-of/cptn-decl-no-itr.js

+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.7.5.11
+description: >
+    Completion value when head has a declaration and no iteration occurs
+info: >
+    IterationStatement : for ( var ForBinding of AssignmentExpression ) Statement
+
+    1. Let keyResult be the result of performing ForIn/OfHeadEvaluation( « »,
+       AssignmentExpression, iterate).
+    2. ReturnIfAbrupt(keyResult).
+    3. Return ForIn/OfBodyEvaluation(ForBinding, Statement, keyResult,
+       varBinding, labelSet).
+
+    13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation
+
+    [...]
+    2. Let V = undefined.
+    [...]
+    5. Repeat
+       a. Let nextResult be IteratorStep(iterator).
+       b. ReturnIfAbrupt(nextResult).
+       c. If nextResult is false, return NormalCompletion(V).
+---*/
+
+
+assert.sameValue(eval('1; for (var a of []) { }'), undefined);
+assert.sameValue(eval('2; for (var b of []) { 3; }'), undefined);

test/language/statements/for-of/cptn-expr-abrupt-empty.js

+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.7.5.11
+description: >
+    Completion value when head has no declaration and iteration is cancelled
+info: >
+    IterationStatement :
+        for ( LeftHandSideExpression of AssignmentExpression ) Statement
+
+    1. Let keyResult be the result of performing ForIn/OfHeadEvaluation( « »,
+       AssignmentExpression, iterate).
+    2. ReturnIfAbrupt(keyResult).
+    3. Return ForIn/OfBodyEvaluation(LeftHandSideExpression, Statement,
+       keyResult, assignment, labelSet).
+
+    13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation
+
+    [...]
+    2. Let V = undefined.
+    [...]
+    5. Repeat
+       a. Let nextResult be IteratorStep(iterator).
+       b. ReturnIfAbrupt(nextResult).
+       c. If nextResult is false, return NormalCompletion(V).
+       [...]
+       k. Let result be the result of evaluating stmt.
+       [...]
+       m. If LoopContinues(result, labelSet) is false, return
+          IteratorClose(iterator, UpdateEmpty(result, V)).
+---*/
+
+assert.sameValue(eval('var a; 1; for (a of [0]) { break; }'), undefined);
+assert.sameValue(eval('var b; 2; for (b of [0]) { 3; break; }'), 3);
+
+assert.sameValue(
+  eval('var a; 4; outer: do { for (a of [0]) { continue outer; } } while (false)'),
+  undefined
+);
+assert.sameValue(
+  eval('var b; 5; outer: do { for (b of [0]) { 6; continue outer; } } while (false)'),
+  6
+);

test/language/statements/for-of/cptn-expr-itr.js

+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.7.5.11
+description: >
+    Completion value when head has no declaration and iteration occurs
+info: >
+    IterationStatement :
+        for ( LeftHandSideExpression of AssignmentExpression ) Statement
+
+    1. Let keyResult be the result of performing ForIn/OfHeadEvaluation( « »,
+       AssignmentExpression, iterate).
+    2. ReturnIfAbrupt(keyResult).
+    3. Return ForIn/OfBodyEvaluation(LeftHandSideExpression, Statement,
+       keyResult, assignment, labelSet).
+
+    13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation
+
+    [...]
+    2. Let V = undefined.
+    [...]
+    5. Repeat
+       a. Let nextResult be IteratorStep(iterator).
+       b. ReturnIfAbrupt(nextResult).
+       c. If nextResult is false, return NormalCompletion(V).
+       [...]
+       k. Let result be the result of evaluating stmt.
+       [...]
+       n. If result.[[value]] is not empty, let V be result.[[value]].
+---*/
+
+assert.sameValue(eval('var a; 1; for (a of [0]) { }'), undefined);
+assert.sameValue(eval('var b; 2; for (b of [0]) { 3; }'), 3);

test/language/statements/for-of/cptn-expr-no-itr.js

+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.7.5.11
+description: >
+    Completion value when head has no declaration and no iteration occurs
+info: >
+    IterationStatement :
+        for ( LeftHandSideExpression of AssignmentExpression ) Statement
+
+    1. Let keyResult be the result of performing ForIn/OfHeadEvaluation( « »,
+       AssignmentExpression, iterate).
+    2. ReturnIfAbrupt(keyResult).
+    3. Return ForIn/OfBodyEvaluation(LeftHandSideExpression, Statement,
+       keyResult, assignment, labelSet).
+
+    13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation
+
+    [...]
+    2. Let V = undefined.
+    [...]
+    5. Repeat
+       a. Let nextResult be IteratorStep(iterator).
+       b. ReturnIfAbrupt(nextResult).
+       c. If nextResult is false, return NormalCompletion(V).
+---*/
+
+
+assert.sameValue(eval('var a; 1; for (a of []) { }'), undefined);
+assert.sameValue(eval('var b; 2; for (b of []) { 3; }'), undefined);

test/language/statements/for/cptn-decl-expr-iter.js

+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.7.4.7
+description: >
+    Completion value when head has a declaration and a "test" expression and iteration occurs
+info: >
+    IterationStatement :
+      for ( var VariableDeclarationList ; Expressionopt ; Expressionopt ) Statement
+
+    1. Let varDcl be the result of evaluating VariableDeclarationList.
+    2. ReturnIfAbrupt(varDcl).
+    3. Return ForBodyEvaluation(the first Expression, the second Expression,
+       Statement, « », labelSet).
+
+    13.7.4.8 Runtime Semantics: ForBodyEvaluation
+    1. Let V = undefined.
+    [...]
+    4. Repeat
+       a. If test is not [empty], then
+          i. Let testRef be the result of evaluating test.
+          ii. Let testValue be GetValue(testRef).
+          iii. ReturnIfAbrupt(testValue).
+          iv. If ToBoolean(testValue) is false, return NormalCompletion(V).
+---*/
+
+assert.sameValue(
+  eval('1; for (var runA = true; runA; runA = false) { }'), undefined
+);
+assert.sameValue(
+  eval('2; for (var runB = true; runB; runB = false) { 3; }'), 3
+);

test/language/statements/for/cptn-decl-expr-no-iter.js

+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.7.4.7
+description: >
+    Completion value when head has a declaration and a "test" expression and no iteration occurs
+info: >
+    IterationStatement :
+      for ( var VariableDeclarationList ; Expressionopt ; Expressionopt ) Statement
+
+    1. Let varDcl be the result of evaluating VariableDeclarationList.
+    2. ReturnIfAbrupt(varDcl).
+    3. Return ForBodyEvaluation(the first Expression, the second Expression,
+       Statement, « », labelSet).
+
+    13.7.4.8 Runtime Semantics: ForBodyEvaluation
+    1. Let V = undefined.
+    [...]
+    4. Repeat
+       a. If test is not [empty], then
+          i. Let testRef be the result of evaluating test.
+          ii. Let testValue be GetValue(testRef).
+          iii. ReturnIfAbrupt(testValue).
+          iv. If ToBoolean(testValue) is false, return NormalCompletion(V).
+---*/
+
+assert.sameValue(eval('1; for (var run = false; run; ) { }'), undefined);
+assert.sameValue(eval('2; for (var run = false; run; ) { 3; }'), undefined);

test/language/statements/for/cptn-expr-expr-iter.js

+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.7.4.7
+description: >
+    Completion value when head has no declaration and a "test" expression and
+    iteration occurs
+info: >
+    IterationStatement :
+      for ( Expressionopt ; Expressionopt ; Expressionopt ) Statement
+
+    1. If the first Expression is present, then
+       a. Let exprRef be the result of evaluating the first Expression.
+       b. Let exprValue be GetValue(exprRef).
+       c. ReturnIfAbrupt(exprValue).
+    2. Return ForBodyEvaluation(the second Expression, the third Expression,
+       Statement, « », labelSet).
+
+    13.7.4.8 Runtime Semantics: ForBodyEvaluation
+    1. Let V = undefined.
+    [...]
+    4. Repeat
+       a. If test is not [empty], then
+          i. Let testRef be the result of evaluating test.
+          ii. Let testValue be GetValue(testRef).
+          iii. ReturnIfAbrupt(testValue).
+          iv. If ToBoolean(testValue) is false, return NormalCompletion(V).
+---*/
+
+assert.sameValue(
+  eval('var runA; 1; for (runA = true; runA; runA = false) { }'), undefined
+);
+assert.sameValue(
+  eval('var runB; 2; for (runB = true; runB; runB = false) { 3; }'), 3
+);

test/language/statements/for/cptn-expr-expr-no-iter.js

+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.7.4.7
+description: >
+    Completion value when head has no declaration and a "test" expression and no iteration occurs
+info: >
+    IterationStatement :
+      for ( Expressionopt ; Expressionopt ; Expressionopt ) Statement
+
+    1. If the first Expression is present, then
+       a. Let exprRef be the result of evaluating the first Expression.
+       b. Let exprValue be GetValue(exprRef).
+       c. ReturnIfAbrupt(exprValue).
+    2. Return ForBodyEvaluation(the second Expression, the third Expression,
+       Statement, « », labelSet).
+
+    13.7.4.8 Runtime Semantics: ForBodyEvaluation
+    1. Let V = undefined.
+    [...]
+    4. Repeat
+       a. If test is not [empty], then
+          i. Let testRef be the result of evaluating test.
+          ii. Let testValue be GetValue(testRef).
+          iii. ReturnIfAbrupt(testValue).
+          iv. If ToBoolean(testValue) is false, return NormalCompletion(V).
+---*/
+
+assert.sameValue(eval('1; for ( ; false; ) { }'), undefined);
+assert.sameValue(eval('2; for ( ; false; ) { 3; }'), undefined);