sema: fix parsing of the stdlib module

Author: mertcandav

std/jule/importer/importer.jule

@@ -76,7 +76,10 @@ impl sema::Importer for importer {
 			if len(newModPath) == 0 {
 				self.mod = nil
 			} else if self.mod == nil || newModPath != self.mod.Path {
-				mut newMod, mut errs := mod::ParseFile(newModPath)
+				isStd := newModPath == build::ModStdlib().Path
+				mut newMod, mut errs := mod::ParseFile(newModPath, mod::ParseOptions{
+					AllowStd: isStd,
+				})
 				if len(errs) != 0 {
 					ret nil, errs
 				}

std/jule/mod/parse.jule

@@ -130,14 +130,14 @@ impl parser {
 
 // Checks the mandatory module information.
 #disable nilptr
-fn checkMod(modfile: str, mod: &Mod, mut &logs: *[]log::Log) {
+fn checkMod(options: ParseOptions, modfile: str, mod: &Mod, mut &logs: *[]log::Log) {
 	if mod.Name == "" {
 		*logs = append(*logs, log::Log{
 			Kind: log::Error,
 			Text: "module file must be have name",
 			Path: modfile,
 		})
-	} else if mod.Name == "std" {
+	} else if !options.AllowStd && mod.Name == "std" {
 		*logs = append(*logs, log::Log{
 			Kind: log::Error,
 			Text: "module name \"std\" is a reserved name",
@@ -147,8 +147,14 @@ fn checkMod(modfile: str, mod: &Mod, mut &logs: *[]log::Log) {
 	}
 }
 
+// Options for the module file parsing.
+struct ParseOptions {
+	// Allows using the reserved "std" module name.
+	AllowStd: bool
+}
+
 // Parse module from the module file path.
-fn ParseFile(path: str): (&Mod, []log::Log) {
+fn ParseFile(path: str, options: ParseOptions): (&Mod, []log::Log) {
 	modfile := filepath::Join(path, jule::ModuleFile)
 	mut bytes := os::ReadFile(modfile) else {
 		ret nil, [{
@@ -170,7 +176,7 @@ fn ParseFile(path: str): (&Mod, []log::Log) {
 	if len(parser.logs) > 0 {
 		ret parser.mod, parser.logs
 	}
-	checkMod(parser.modfile, parser.mod, &parser.logs)
+	checkMod(options, parser.modfile, parser.mod, &parser.logs)
 	ret parser.mod, parser.logs
 }