**🐞 Describe the bug**

[Khaterehnajafi]

🐞 Describe the bug
There's an error when compiling at line counter = counter+1; that says:

./contracts/main.fc:5:15: error: undefined function `counter+1`, defining a global function of unknown type
      counter = counter+1;
                ^
Compilation error
Func compilation error: ./contracts/main.fc:5:24: error: cannot assign an expression of type ??2 -> ??3 to a variable or pattern of type int: cannot unify type int with ??2 -> ??3
      counter = counter+1;

the error can be fixed by adding spaces: counter = counter + 1;
Is this intended behaviour? To me it looks like a bug, because those spaces should not impact the compilation process.

💻 Environment
Node.js v18.16.0 with package "@ton-community/func-js": "^0.7.0",

🔢 Code to reproduce bug
main.fc

() recv_internal(int msg_value, cell in_msg, slice in_msg_body) impure {
    int counter = 1;
    counter = counter+1;
}

compile.ts

import * as fs from "fs";
import process from "process";
import { Cell } from "ton-core";
import { compileFunc } from "@ton-community/func-js";

async function compileScript() {
  console.log("Compile script is running...");
  const compileResult = await compileFunc({
    targets: ["./contracts/main.fc"],
    sources: (x) => fs.readFileSync(x).toString("utf8"),
  });

  if (compileResult.status === "error") {
    console.error("Compilation error");
    console.error(compileResult.message);
    process.exit(1);
  }

  console.error("Compilation successful");

  const hex = Cell.fromBoc(Buffer.from(compileResult.codeBoc, "base64"))[0]
    .toBoc()
    .toString("hex");

  fs.writeFileSync(
    "build/main.compiled.json",
    JSON.stringify({
      hex,
    })
  );
}

compileScript();

Originally posted by @andrewslock in ton-community/func-js#26

[andrewslock]

I think it's intended behaviour because FunC supports various symbols like +-_:./?!~ in a variable's name. So the compiler interprets counter+1 as a reference to a variable "counter+1" which does not exist, meaning that a code like this should work:

() recv_internal(int msg_value, cell in_msg, slice in_msg_body) impure {
    int counter+1 = 1;
    counter+1 = counter+1 + 1;
}

crazy right?