Show how to generate code with error message

3 files changed, 8 insertions, 6 deletions

diff --git a/crates/tools/src/lib.rs b/crates/tools/src/lib.rs
index 352f4d135..7b5a60847 100644
--- a/crates/tools/src/lib.rs
+++ b/crates/tools/src/lib.rs
@@ -13,7 +13,7 @@ use std::{
 use itertools::Itertools;
 use heck::{CamelCase, ShoutySnakeCase, SnakeCase};
 
-type Result<T> = ::std::result::Result<T, failure::Error>;
+pub type Result<T> = ::std::result::Result<T, failure::Error>;
 
 #[derive(Debug)]
 pub struct Test {
diff --git a/crates/tools/src/main.rs b/crates/tools/src/main.rs
index cf5e662b0..179c1163f 100644
--- a/crates/tools/src/main.rs
+++ b/crates/tools/src/main.rs
@@ -11,9 +11,7 @@ use std::{
     path::{Path, PathBuf},
     process::Command,
 };
-use tools::{Test, collect_tests, render_template, update};
-
-type Result<T> = ::std::result::Result<T, failure::Error>;
+use tools::{Test, collect_tests, render_template, update, Result};
 
 const GRAMMAR_DIR: &str = "./crates/ra_syntax/src/grammar";
 const INLINE_TESTS_DIR: &str = "./crates/ra_syntax/tests/data/parser/inline";
diff --git a/crates/tools/tests/cli.rs b/crates/tools/tests/cli.rs
index 26d9a991c..4d5b03b65 100644
--- a/crates/tools/tests/cli.rs
+++ b/crates/tools/tests/cli.rs
@@ -11,6 +11,10 @@ const AST_TEMPLATE: &str = "../ra_syntax/src/ast/generated.rs.tera";
 
 #[test]
 fn verify_template_generation() {
-    update(Path::new(SYNTAX_KINDS), &render_template(SYNTAX_KINDS_TEMPLATE, GRAMMAR).unwrap(), true).unwrap();
-    update(Path::new(AST), &render_template(AST_TEMPLATE, GRAMMAR).unwrap(), true).unwrap();
+    if let Err(error) = update(Path::new(SYNTAX_KINDS), &render_template(SYNTAX_KINDS_TEMPLATE, GRAMMAR).unwrap(), true) {
+        panic!("{}. Please update it by running `cargo gen-kinds`", error);
+    }
+    if let Err(error) = update(Path::new(AST), &render_template(AST_TEMPLATE, GRAMMAR).unwrap(), true) {
+        panic!("{}. Please update it by running `cargo gen-kinds`", error);
+    }
 }
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