Highlighting breaks on function type with generics

[rbuckton]

Found in:

Version: 1.30.0-insider (user setup)
Commit: 04cbc78e23eeddc368d634ed52402dbc6f28ebc9
Date: 2018-11-23T10:06:54.093Z
Electron: 2.0.12
Chrome: 61.0.3163.100
Node.js: 8.9.3
V8: 6.1.534.41
OS: Windows_NT x64 10.0.17134

See https://github.com/Microsoft/TypeScript/pull/28645/files#diff-942ae3cd2a8bbd85ed86a60cd7c43307R6928

export interface ObjectAllocator { 
        getNodeConstructor(): new (kind: SyntaxKind, pos?: number, end?: number) => Node; 
        getTokenConstructor(): new <TKind extends SyntaxKind>(kind: TKind, pos?: number, end?: number) => Token<TKind>; 
        // syntax highlighting is completely broken for the rest of the file...
}