time-equal garbled message when time returned from function

[mdelah]

Describe the bug
The time-equal rule passes an ast.Expr to a %s placeholder in its message format, but not all ast.Expr implement String(), so junk is output for certain kinds of expressions (such as comparing a time.Time that's returned from a function call).

To Reproduce
Steps to reproduce the behavior:

1. I updated revive go install github.com/mgechev/revive@latest
2. I run it with the following flags & configuration file:

revive -config revive.toml time-equal-test.go

# config file
ignoreGeneratedHeader = false
severity = "warning"
confidence = 0.0
errorCode = 0
warningCode = 0

[rule.time-equal]

Source file time-equal-test.go:

package test

import "time"

func isNow(t time.Time) bool { return t == time.Now() }

Expected behavior
Something more readable than:

time-equal-test.go:5:39: use t.Equal(&{%!s(*ast.SelectorExpr=&{0xc00007e7a0 0xc00007e7c0}) %!s(token.Pos=81) [] %!s(token.Pos=0) %!s(token.Pos=82)}) instead of "==" operator

[chavacava]

Hi @mdelah thanks for filling the issue.