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Merge #4396

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4396: Improve panic message for ast_from_text r=jonas-schievink a=edwin0cheng

Related: #4368

Co-authored-by: Edwin Cheng <edwin0cheng@gmail.com>
This commit is contained in:
bors[bot] 2020-05-10 18:01:20 +00:00 committed by GitHub
commit bfb40a698d
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1 changed files with 6 additions and 1 deletions
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7
crates/ra_syntax/src/ast/make.rs
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@ -300,7 +300,12 @@ pub fn add_pub_crate_modifier(fn_def: ast::FnDef) -> ast::FnDef {
fn ast_from_text<N: AstNode>(text: &str) -> N {
let parse = SourceFile::parse(text);
let node = parse.tree().syntax().descendants().find_map(N::cast).unwrap();
let node = match parse.tree().syntax().descendants().find_map(N::cast) {
Some(it) => it,
None => {
panic!("Failed to make ast node `{}` from text {}", std::any::type_name::<N>(), text)
}
};
let node = node.syntax().clone();
let node = unroot(node);
let node = N::cast(node).unwrap();