For details see the [language spec](/ref/spec#For_statements).

<!-- go.dev/issue/46477, CL 566856, CL 586955, CL 586956 -->
Go 1.23 includes preview support for [generic type aliases](/issue/46477).

		generated by running a "go build -cover" binary.
		Requires that GOEXPERIMENT=coverageredesign is enabled.

Special-purpose environment variables:

	GCCGOTOOLDIR
		If set, where to find gccgo tools, such as cgo.
		The default is based on how gccgo was configured.
	GOEXPERIMENT
		Comma-separated list of toolchain experiments to enable or disable.

//		generated by running a "go build -cover" binary.
//		Requires that GOEXPERIMENT=coverageredesign is enabled.
//
// Special-purpose environment variables:
//
//	GCCGOTOOLDIR
//		If set, where to find gccgo tools, such as cgo.
//		The default is based on how gccgo was configured.
//	GOEXPERIMENT
//		Comma-separated list of toolchain experiments to enable or disable.

		}

		// GOARM, GOMIPS, etc.
		key, val, _ := cfg.GetArchEnv()
		fmt.Fprintf(h, "%s=%s\n", key, val)

		if cfg.CleanGOEXPERIMENT != "" {
			fmt.Fprintf(h, "GOEXPERIMENT=%q\n", cfg.CleanGOEXPERIMENT)
		}

		// TODO(rsc): Convince compiler team not to add more magic environment variables,
		// or perhaps restrict the environment variables passed to subprocesses.