Compiler has bug() to wrap unexpected errors

compiler/compile-unit.go

@@ -24,7 +24,7 @@ func (this *Compiler) CompileUnit (address entity.Address) error {
 
 	irModule, err := native.NativeTarget().Generate(semanticTree)
 	if err != nil {
-		return errors.New(fmt.Sprintf("internal errror: %v", err))
+		return this.bug(err)
 	}
 
 	// if the format isn't specified, try to get it from the filename

compiler/compiler.go

@@ -23,6 +23,17 @@ type Compiler struct {
 	Format       string
 }
 
+func (this *Compiler) bug (err error) error {
+	return errors.New(fmt.Sprintln (
+		"Bug detected in the compiler!\n" +
+		"The FSPL compiler has experienced an error that should not",
+		"happen.\n" +
+		"Please submit a report with this info and the code you were",
+		"compiling to:",
+		"https://git.tebibyte.media/sashakoshka/fspl/issues\n" +
+		"The error is:", err))
+}
+
 func (this *Compiler) AnalyzeUnit (
 	semanticTree *analyzer.Tree,
 	path         string,