third_party_rust_syn/tests/test_stmt.rs

#![allow(clippy::assertions_on_result_states, clippy::non_ascii_literal)]

#[macro_use]
mod macros;

use proc_macro2::{Delimiter, Group, Ident, Span, TokenStream, TokenTree};
use quote::quote;
use std::iter::FromIterator;
use syn::Stmt;

#[test]
fn test_raw_operator() {
    let stmt = syn::parse_str::<Stmt>("let _ = &raw const x;").unwrap();

    snapshot!(stmt, @r###"
    Local(Local {
        pat: Pat::Wild,
        init: Some(Verbatim(`& raw const x`)),
    })
    "###);
}

#[test]
fn test_raw_variable() {
    let stmt = syn::parse_str::<Stmt>("let _ = &raw;").unwrap();

    snapshot!(stmt, @r###"
    Local(Local {
        pat: Pat::Wild,
        init: Some(Expr::Reference {
            expr: Expr::Path {
                path: Path {
                    segments: [
                        PathSegment {
                            ident: "raw",
                            arguments: None,
                        },
                    ],
                },
            },
        }),
    })
    "###);
}

#[test]
fn test_raw_invalid() {
    assert!(syn::parse_str::<Stmt>("let _ = &raw x;").is_err());
}

#[test]
fn test_none_group() {
    // <Ø async fn f() {} Ø>
    let tokens = TokenStream::from_iter(vec![TokenTree::Group(Group::new(
        Delimiter::None,
        TokenStream::from_iter(vec![
            TokenTree::Ident(Ident::new("async", Span::call_site())),
            TokenTree::Ident(Ident::new("fn", Span::call_site())),
            TokenTree::Ident(Ident::new("f", Span::call_site())),
            TokenTree::Group(Group::new(Delimiter::Parenthesis, TokenStream::new())),
            TokenTree::Group(Group::new(Delimiter::Brace, TokenStream::new())),
        ]),
    ))]);

    snapshot!(tokens as Stmt, @r###"
    Item(Item::Fn {
        vis: Inherited,
        sig: Signature {
            asyncness: Some,
            ident: "f",
            generics: Generics,
            output: Default,
        },
        block: Block,
    })
    "###);
}

#[test]
fn test_let_dot_dot() {
    let tokens = quote! {
        let .. = 10;
    };

    snapshot!(tokens as Stmt, @r###"
    Local(Local {
        pat: Pat::Rest,
        init: Some(Expr::Lit {
            lit: 10,
        }),
    })
    "###);
}