From 3cbf99053f938c0ab23cdb84ff65b81da1465b51 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jakub=20=C5=BD=C3=A1dn=C3=ADk?= <kubouch@gmail.com>
Date: Tue, 28 Sep 2021 21:12:46 +0300
Subject: [PATCH] Throw an error if using export outside of module

---
 crates/nu-parser/src/errors.rs | 8 ++++++++
 crates/nu-parser/src/parser.rs | 4 ++++
 2 files changed, 12 insertions(+)

diff --git a/crates/nu-parser/src/errors.rs b/crates/nu-parser/src/errors.rs
index 58123aac0d..f55fed2da7 100644
--- a/crates/nu-parser/src/errors.rs
+++ b/crates/nu-parser/src/errors.rs
@@ -57,6 +57,14 @@ pub enum ParseError {
     #[diagnostic(code(nu::parser::expected_keyword), url(docsrs))]
     ExpectedKeyword(String, #[label("expected {0}")] Span),
 
+    #[error("Unexpected keyword.")]
+    #[diagnostic(
+        code(nu::parser::unexpected_keyword),
+        url(docsrs),
+        help("'export' keyword is allowed only in a module.")
+    )]
+    UnexpectedKeyword(String, #[label("unexpected {0}")] Span),
+
     #[error("Multiple rest params.")]
     #[diagnostic(code(nu::parser::multiple_rest_params), url(docsrs))]
     MultipleRestParams(#[label = "multiple rest params"] Span),
diff --git a/crates/nu-parser/src/parser.rs b/crates/nu-parser/src/parser.rs
index 59508cdfe2..daff7c6054 100644
--- a/crates/nu-parser/src/parser.rs
+++ b/crates/nu-parser/src/parser.rs
@@ -2585,6 +2585,10 @@ pub fn parse_statement(
         b"alias" => parse_alias(working_set, spans),
         b"module" => parse_module(working_set, spans),
         b"use" => parse_use(working_set, spans),
+        b"export" => (
+            garbage_statement(spans),
+            Some(ParseError::UnexpectedKeyword("export".into(), spans[0])),
+        ),
         _ => {
             let (expr, err) = parse_expression(working_set, spans);
             (Statement::Pipeline(Pipeline::from_vec(vec![expr])), err)