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A variable is represented by an integer. \n    case Var(Int32),\n\n    // A lambda abstracation expression. A variable is represented by an integer.\n    case Abs(Int32, Expression),\n\n    // A function application expression.\n    case App(Expression, Expression),\n}\n\n///\n/// Performs alpha conversion by introducing fresh variables for all variables in the given expression `e0`.\n///\ndef alpha(e0: Expression, m: Map[Int32, Int32]): Expression = match e0 {\n    case Var(x) =\u003e\n        // Check if we need to rename the variable.\n        match Map.get(x, m) {\n            case None =\u003e Var(x)\n            case Some(y) =\u003e Var(y)\n        }\n\n    case Abs(x, e) =\u003e\n        // Generate a fresh variable name for `x`.\n        let y = freshVar();\n        Abs(y, alpha(e, Map.insert(x, y, m)))\n\n    case App(e1, e2) =\u003e\n        // Recursively perform alpha conversion on each expression.\n        App(alpha(e1, m), alpha(e2, m))\n}\n```\n\n## Building\n\nSee [docs/BUILD.md](docs/BUILD.md).\n\n## License\n\nFlix is available under the Apache 2.0 license.\n\n## Sponsors\n\nWe kindly thank [EJ Technologies](https://www.ej-technologies.com/) for providing us with \n[JProfiler](http://www.ej-technologies.com/products/jprofiler/overview.html)\nand [JetBrains](https://www.jetbrains.com/) for providing us with \n[IntelliJ IDEA](https://www.jetbrains.com/idea/).\n","funding_links":[],"categories":["Scala","Uncategorized","Flix","JVM语言","Functional","\u003ca name=\"Flix\"\u003e\u003c/a\u003eFlix"],"sub_categories":["Uncategorized"],"project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fflix%2Fflix","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fflix%2Fflix","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fflix%2Fflix/lists"}