Type guards in switch statement

[srolel]

TypeScript Version: 2.7.0-dev.201xxxxx

Code

function foo(baz: boolean | (() => boolean)) {
    switch (typeof baz) {
        case 'boolean':
            break;
        case 'function':
            baz();
            break;
    }
}

Expected behavior:

Should compile, similar to the equivalent usage of if statement type guards.

Actual behavior:

Does not compile with error:

[ts] Cannot invoke an expression whose type lacks a call signature. Type 'Boolean' has no compatible call signatures.

[mhegazy]

Duplicate of #2214

[typescript-bot]

Automatically closing this issue for housekeeping purposes. The issue labels indicate that it is unactionable at the moment or has already been addressed.