==== tests/cases/conformance/ambient/ambientErrors.ts (16 errors) ====
    // Ambient variable with an initializer 
    declare var x = 4;
                  ~
!!! Initializers are not allowed in ambient contexts.
    
    // Ambient functions with invalid overloads
    declare function fn(x: number): string;
    declare function fn(x: 'foo'): number;
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
!!! Specialized overload signature is not assignable to any non-specialized signature.
    
    // Ambient functions with duplicate signatures
    declare function fn1(x: number): string;
    declare function fn1(x: number): string;
    
    // Ambient function overloads that differ only by return type
    declare function fn2(x: number): string;
    declare function fn2(x: number): number;
    
    // Ambient function with default parameter values
    declare function fn3(x = 3);
                         ~~~~~
!!! A parameter initializer is only allowed in a function or constructor implementation.
    
    // Ambient function with function body
    declare function fn4() { };
                           ~
!!! A function implementation cannot be declared in an ambient context.
    
    // Ambient enum with non - integer literal constant member
    declare enum E1 {
        y = 4.23
        ~
!!! Ambient enum elements can only have integer literal initializers.
    }
    
    // Ambient enum with computer member
    declare enum E2 {
        x = 'foo'.length
        ~
!!! Ambient enum elements can only have integer literal initializers.
    }
    
    // Ambient module with initializers for values, bodies for functions / classes
    declare module M1 {
        var x = 3;
              ~
!!! Initializers are not allowed in ambient contexts.
        function fn() { }
                      ~
!!! A function implementation cannot be declared in an ambient context.
        class C {
            static x = 3;
                     ~
!!! Initializers are not allowed in ambient contexts.
            y = 4;
              ~
!!! Initializers are not allowed in ambient contexts.
            constructor() { }
                          ~
!!! A constructor implementation cannot be declared in an ambient context.
            fn() { }
                 ~
!!! A function implementation cannot be declared in an ambient context.
            static sfn() { }
                         ~
!!! A function implementation cannot be declared in an ambient context.
        }
    }
    
    // Ambient external module not in the global module
    module M2 {
        declare module 'nope' { }
                       ~~~~~~
!!! Ambient external modules cannot be nested in other modules.
    }
    
    // Ambient external module with a string literal name that isn't a top level external module name
    declare module '../foo' { }
                   ~~~~~~~~
!!! Ambient external module declaration cannot specify relative module name.
    
    // Ambient external module with export assignment and other exported members
    declare module 'bar' {
        var n;
        export var q;
        export = n;
        ~~~~~~~~~~~
!!! An export assignment cannot be used in a module with other exported elements.
    }