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Deprecate downlevelIteration
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‎src/compiler/program.ts‎

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@@ -4553,6 +4553,9 @@ export function createProgram(_rootNamesOrOptions: readonly string[] | CreatePro
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if (options.module === ModuleKind.None || options.module === ModuleKind.AMD || options.module === ModuleKind.UMD || options.module === ModuleKind.System) {
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createDeprecatedDiagnostic("module", ModuleKind[options.module], /*useInstead*/ undefined, /*related*/ undefined);
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}
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if (options.downlevelIteration !== undefined) {
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createDeprecatedDiagnostic("downlevelIteration");
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}
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});
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}
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‎src/compiler/types.ts‎

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@@ -7431,6 +7431,7 @@ export interface CompilerOptions {
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disableSourceOfProjectReferenceRedirect?: boolean;
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disableSolutionSearching?: boolean;
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disableReferencedProjectLoad?: boolean;
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/** @deprecated */
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downlevelIteration?: boolean;
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emitBOM?: boolean;
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emitDecoratorMetadata?: boolean;

‎tests/baselines/reference/ES5For-of33(target=es2015).errors.txt‎

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error TS5101: Option 'downlevelIteration' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
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!!! error TS5101: Option 'downlevelIteration' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
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==== ES5For-of33.ts (0 errors) ====
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for (var v of ['a', 'b', 'c']) {
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console.log(v);
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}

‎tests/baselines/reference/ES5For-of33(target=es5).errors.txt‎

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error TS5101: Option 'downlevelIteration' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
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error TS5107: Option 'target=ES5' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
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!!! error TS5101: Option 'downlevelIteration' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
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!!! error TS5107: Option 'target=ES5' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
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==== ES5For-of33.ts (0 errors) ====
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for (var v of ['a', 'b', 'c']) {

‎tests/baselines/reference/ES5For-of34(target=es2015).errors.txt‎

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error TS5101: Option 'downlevelIteration' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
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ES5For-of34.ts(4,6): error TS2322: Type 'string' is not assignable to type 'number'.
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!!! error TS5101: Option 'downlevelIteration' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
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==== ES5For-of34.ts (1 errors) ====
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function foo() {
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return { x: 0 };

‎tests/baselines/reference/ES5For-of34(target=es5).errors.txt‎

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error TS5101: Option 'downlevelIteration' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
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error TS5107: Option 'target=ES5' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
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ES5For-of34.ts(4,6): error TS2322: Type 'string' is not assignable to type 'number'.
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!!! error TS5101: Option 'downlevelIteration' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
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!!! error TS5107: Option 'target=ES5' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
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==== ES5For-of34.ts (1 errors) ====
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function foo() {

‎tests/baselines/reference/ES5For-of35(target=es2015).errors.txt‎

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error TS5101: Option 'downlevelIteration' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
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ES5For-of35.ts(1,13): error TS2339: Property 'x' does not exist on type 'Number'.
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ES5For-of35.ts(1,23): error TS2339: Property 'y' does not exist on type 'Number'.
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!!! error TS5101: Option 'downlevelIteration' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
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==== ES5For-of35.ts (2 errors) ====
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for (const {x: a = 0, y: b = 1} of [2, 3]) {
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~

‎tests/baselines/reference/ES5For-of35(target=es5).errors.txt‎

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error TS5101: Option 'downlevelIteration' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
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error TS5107: Option 'target=ES5' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
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ES5For-of35.ts(1,13): error TS2339: Property 'x' does not exist on type 'Number'.
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ES5For-of35.ts(1,23): error TS2339: Property 'y' does not exist on type 'Number'.
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!!! error TS5101: Option 'downlevelIteration' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
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!!! error TS5107: Option 'target=ES5' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
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==== ES5For-of35.ts (2 errors) ====
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for (const {x: a = 0, y: b = 1} of [2, 3]) {

‎tests/baselines/reference/ES5For-of36(target=es2015).errors.txt‎

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error TS5101: Option 'downlevelIteration' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
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ES5For-of36.ts(1,10): error TS2488: Type 'number' must have a '[Symbol.iterator]()' method that returns an iterator.
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!!! error TS5101: Option 'downlevelIteration' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
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==== ES5For-of36.ts (1 errors) ====
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for (let [a = 0, b = 1] of [2, 3]) {
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~~~~~~~~~~~~~~

‎tests/baselines/reference/ES5For-of36(target=es5).errors.txt‎

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error TS5101: Option 'downlevelIteration' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
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error TS5107: Option 'target=ES5' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
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ES5For-of36.ts(1,10): error TS2548: Type 'number' is not an array type or does not have a '[Symbol.iterator]()' method that returns an iterator.
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!!! error TS5101: Option 'downlevelIteration' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
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!!! error TS5107: Option 'target=ES5' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
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==== ES5For-of36.ts (1 errors) ====
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for (let [a = 0, b = 1] of [2, 3]) {

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