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Add proc-macro-srv integration test that clones literals #12833

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Merged
merged 1 commit into from
Jul 20, 2022
Merged

Add proc-macro-srv integration test that clones literals #12833

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24 changes: 22 additions & 2 deletions crates/proc-macro-srv/src/tests/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -27,7 +27,7 @@ fn test_derive_error() {
}

#[test]
fn test_fn_like_macro() {
fn test_fn_like_macro_noop() {
assert_expand(
"fn_like_noop",
r#"ident, 0, 1, []"#,
Expand All @@ -44,7 +44,7 @@ fn test_fn_like_macro() {
}

#[test]
fn test_fn_like_macro2() {
fn test_fn_like_macro_clone_ident_subtree() {
assert_expand(
"fn_like_clone_tokens",
r#"ident, []"#,
Expand All @@ -56,6 +56,26 @@ fn test_fn_like_macro2() {
);
}

#[test]
fn test_fn_like_macro_clone_literals() {
assert_expand(
"fn_like_clone_tokens",
r#"1u16, 2_u32, -4i64, 3.14f32, "hello bridge""#,
expect![[r#"
SUBTREE $
LITERAL 1u16 4294967295
PUNCH , [alone] 4294967295
LITERAL 2_u32 4294967295
PUNCH , [alone] 4294967295
PUNCH - [alone] 4294967295
LITERAL 4i64 4294967295
PUNCH , [alone] 4294967295
LITERAL 3.14f32 4294967295
PUNCH , [alone] 4294967295
LITERAL "hello bridge" 4294967295"#]],
);
}

#[test]
fn test_attr_macro() {
// Corresponds to
Expand Down
10 changes: 8 additions & 2 deletions crates/proc-macro-test/imp/src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -2,7 +2,7 @@

#![warn(rust_2018_idioms, unused_lifetimes, semicolon_in_expressions_from_macros)]

use proc_macro::{Group, Ident, Punct, TokenStream, TokenTree};
use proc_macro::{Group, Ident, Literal, Punct, TokenStream, TokenTree};

#[proc_macro]
pub fn fn_like_noop(args: TokenStream) -> TokenStream {
Expand Down Expand Up @@ -71,6 +71,12 @@ fn clone_tree(t: TokenTree) -> TokenTree {
new.set_span(orig.span());
TokenTree::Punct(new)
}
TokenTree::Literal(_orig) => unimplemented!(),
TokenTree::Literal(orig) => {
// this goes through `literal_from_str` as of 2022-07-18, cf.
// https://github.com/rust-lang/rust/commit/b34c79f8f1ef4d0149ad4bf77e1759c07a9a01a8
let mut new: Literal = orig.to_string().parse().unwrap();
new.set_span(orig.span());
TokenTree::Literal(new)
}
}
}