Hello

this will not work for go versions older than 1.20

the reason is: unsafe.String was added on 1.20

this code will not compile on go 1.19, for instance

an alternative is to use unsafe.Pointer like in the example below

https://github.com/valyala/fasthttp/blob/master/b2s_old.go

however there is another issue: the signature of Unwrap method uses a new alternative format (when return an slice of errors)

but for older versions of go this Unwrap signature:

will use the standard errors package that does not support it.

IMHO we should drop this implementation (or specify an Unwrap function for older versions that supports both signatures) since the go.mod specifies go 1.20

and change the Join implementation for newer version of go to be a function that delegate the call to errors package like we do for Unwrap instead specify a public global variable that points to the Join function.

https://github.com/thanos-io/thanos/tree/main/pkg/errors is a light replacement of pkg/errors for error wrapping.

• Add examples for generic functions
• Remove "convert" section

Use github.com/fatih/color, highlight error text, stacktrace parts (line number, path to file, stacktrace element) with different colors and bold/faint.

Example of colored formatted string:

fmt.Println(
	color.New(color.FgCyan).Sprintf("[%5s]", time.Since(start).Round(time.Second)),
	color.New().Sprint(req.Method),
	color.New(color.Faint).Sprint(req.URL),
	color.New(color.FgYellow).Sprint(lastStatus),
)

Probably implement it as some variant of %+v formatting (do we support flags in formatting strings here?).