UInt64 literals cause runtime overflow errors.

[y-ich]

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Issue Summary

[Insert a brief but thorough description of the issue]

UInt64 literals such as 0xffffffffffffffff, cause runtime overflow errors at https://github.com/yanagiba/swift-ast/blob/e8507d78b32dbd33ea5ea975bbbc82b7613870a1/Sources/Lexer/Lexer%2BNumericLiteral.swift#L94

Environment

• OS Info: [Please insert the operating system name and version]
• Yanagiba/swift-ast version: [Please insert the swift-ast version]

Reproduction Steps

[Detailed steps to reproduce the issue.]

Sample code

``` [Insert sample source code here] ``` Command to run `swift-ast` with the code above: `swift-ast sample.swift`

Expected Result

What do you expect to happen as a result of the reproduction steps?

Actual Behavior

What currently happens as a result of the reproduction steps?

[
  Insert the current outputs and
  maybe other information that
  could help us understand the issue better
]

Even Better

Is your project open sourced? If yes, can you point us to your repository? If not, is it possible to make a small project that fails the Travis CI? If not, can you create a gist with your sample code for us?

[ryuichi-assistant]

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