Fix compilation option of Go

Author: koba-e964

.verify-helper/config.toml

@@ -3,3 +3,11 @@ compile = "bash -c 'echo hello > {tempdir}/hello'"
 execute = "env AWKPATH={basedir} awk -f {path}"
 bundle = "false"
 list_dependencies = "sed 's/^@include \"\\(.*\\)\"$/\\1/ ; t ; d' {path}"
+
+[languages.go]
+# Because of Go modules, go run does not work outside a module.
+# With -C option, go run changes directory and executes otherwise normally.
+# We need to add the prefix ../../ because {path} is something like examples/go/helloworld.test.go
+# and the argument is interpreted relative to ./examples/go.
+# -C option is available in Go >=1.20.
+execute = "go run -C ./examples/go ../../{path}"

examples/go/go.mod

@@ -0,0 +1,3 @@
+module example-go
+
+go 1.20

examples/go/helloworld.test.go

@@ -3,10 +3,10 @@
 package main
 
 import (
-    "fmt"
-    "./helloworld"
+	"example-go/helloworld"
+	"fmt"
 )
 
 func main() {
-    fmt.Printf("%s\n", helloworld.GetHelloWorld())
+	fmt.Printf("%s\n", helloworld.GetHelloWorld())
 }