tests/cases/compiler/collisionThisExpressionAndAmbientVarInGlobal.ts(3,1): error TS2400: Expression resolves to variable declaration '_this' that compiler uses to capture 'this' reference.
==== tests/cases/compiler/collisionThisExpressionAndAmbientVarInGlobal.ts (1 errors) ====
declare var _this: number; // no error as no code gen
var f = () => this;
_this = 10; // Error
~~~~~
!!! error TS2400: Expression resolves to variable declaration '_this' that compiler uses to capture 'this' reference.
