Failed to compile the `assert` expression with the sub expression `-(-2)` or `+2`

[forchid]

Describe the bug

In the expression assert, failed to compile those simple math sub expressions such as -(-2) , +2.

Reproduction Steps

the test

testfiles> v conv_test.v
conv_test.v:8:33: error: invalid expression: unexpected token `==`
    6 |   assert strconv.atoi('-2')! == -2
    7 |   assert strconv.atoi('+2')! == i - 1 + 1
    8 |   assert strconv.atoi('+2')! == -(-2)
      |                                 ^
    9 |   assert strconv.atoi('+2')! == +2
   10 | }
testfiles> v conv_test.v
conv_test.v:9:33: error: invalid expression: unexpected token `+`
    7 |   assert strconv.atoi('+2')! == i - 1 + 1
    8 |   //assert strconv.atoi('+2')! == -(-2)
    9 |   assert strconv.atoi('+2')! == +2
      |                                 ^
   10 | }
testfiles>

the test source

import strconv

fn test_atoi() ! {
  i := 2
  assert strconv.atoi('1')! == 1
  assert strconv.atoi('-2')! == -2
  assert strconv.atoi('+2')! == i - 1 + 1
  assert strconv.atoi('+2')! == -(-2)
  assert strconv.atoi('+2')! == +2
}

Expected Behavior

Compiling ok.

Current Behavior

Failed to compile it.

Possible Solution

No response

Additional Information/Context

No response

V version

V 0.5.1 0c3183c

Environment details (OS name and version, etc.)

Windows 10 amd64.

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