Update syn, transitively, to 2.0.

contrib/db_pools/codegen/Cargo.toml

@@ -14,7 +14,7 @@ rust-version = "1.56"
 proc-macro = true
 
 [dependencies]
-devise = "0.3"
+devise = "0.4"
 quote = "1"
 
 [dev-dependencies]

contrib/sync_db_pools/codegen/Cargo.toml

@@ -15,7 +15,7 @@ proc-macro = true
 
 [dependencies]
 quote = "1.0"
-devise = "0.3"
+devise = "0.4"
 
 [dev-dependencies]
 version_check = "0.9"

core/codegen/Cargo.toml

@@ -18,9 +18,9 @@ proc-macro = true
 [dependencies]
 indexmap = "1.0"
 quote = "1.0"
-syn = { version = "1.0.72", features = ["full", "visit", "visit-mut", "extra-traits"] }
+syn = { version = "2.0", features = ["full", "visit", "visit-mut", "extra-traits"] }
 proc-macro2 = "1.0.27"
-devise = "0.3.1"
+devise = "0.4"
 rocket_http = { version = "0.5.0-rc.2", path = "../http/" }
 unicode-xid = "0.2"
 glob = "0.3"

core/codegen/src/attribute/catch/mod.rs

@@ -23,7 +23,7 @@ pub fn _catch(
 
     // Determine the number of parameters that will be passed in.
     if catch.function.sig.inputs.len() > 2 {
-        return Err(catch.function.sig.paren_token.span
+        return Err(catch.function.sig.paren_token.span.join()
             .error("invalid number of arguments: must be zero, one, or two")
             .help("catchers optionally take `&Request` or `Status, &Request`"));
     }

core/codegen/src/attribute/route/parse.rs

@@ -137,7 +137,7 @@ impl Route {
         }
 
         // Check the validity of function arguments.
-        let span = handler.sig.paren_token.span;
+        let span = handler.sig.paren_token.span.join();
         let mut arguments = Arguments { map: ArgumentMap::new(), span };
         for arg in &handler.sig.inputs {
             if let Some((ident, ty)) = arg.typed() {

core/codegen/src/bang/typed_stream.rs

@@ -1,11 +1,13 @@
 use proc_macro2::TokenStream;
 use syn::parse::{Parse, ParseStream, discouraged::Speculative};
 
+#[derive(Debug)]
 pub enum Input {
     Type(syn::Type, Option<(syn::Token![+], syn::Lifetime)>),
     Tokens(TokenStream)
 }
 
+#[derive(Debug)]
 struct Invocation {
     ty_stream_ty: syn::Path,
     stream_mac: syn::Path,
@@ -38,11 +40,9 @@ impl Parse for Input {
     fn parse(input: ParseStream<'_>) -> syn::Result<Self> {
         let fork = input.fork();
         if let Ok(mut ty) = fork.parse() {
-            input.advance_to(&fork);
-
             // If there's an extra + '_, use it in the reinterpretation.
-            let mut bound = match input.parse() {
+            let mut bound = match fork.parse() {
-                Ok(plus) => Some((plus, input.parse()?)),
+                Ok(plus) => Some((plus, fork.parse()?)),
                 _ => None,
             };
 
@@ -52,7 +52,13 @@ impl Parse for Input {
                 bound = Some((plus, lt));
             }
 
-            Ok(Input::Type(ty, bound))
+            // If we have nothing else to parse, this must have been a type.
+            if fork.is_empty() {
+                input.advance_to(&fork);
+                Ok(Input::Type(ty, bound))
+            } else {
+                Ok(Input::Tokens(input.parse()?))
+            }
         } else {
             Ok(Input::Tokens(input.parse()?))
         }
@@ -75,7 +81,8 @@ impl Parse for Invocation {
 /// eagerly on a single token, so something like `foo!(for x in 0..10 {})` will
 /// match a `($ty)` branch as will anything that starts with a path.
 pub fn _macro(input: proc_macro::TokenStream) -> devise::Result<TokenStream> {
-    let i: Invocation = syn::parse(input)?;
+    let tokens = proc_macro2::TokenStream::from(input);
+    let i: Invocation = syn::parse2(tokens)?;
     let (s_ty, mac, s_trait) = (i.ty_stream_ty, i.stream_mac, i.stream_trait);
     let tokens = match i.input {
         Input::Tokens(tt) => quote!(#s_ty::from(#mac!(#tt))),

core/codegen/src/bang/uri_parsing.rs

@@ -163,7 +163,7 @@ impl Parse for Args {
         }
 
         // Parse arguments. Ensure both types of args were not used at once.
-        let args: Punctuated<Arg, Token![,]> = input.parse_terminated(Arg::parse)?;
+        let args = input.parse_terminated(Arg::parse, Token![,])?;
         let mut first_is_named = None;
         for arg in &args {
             if let Some(first_is_named) = first_is_named {
@@ -314,7 +314,7 @@ impl Parse for InternalUriParams {
 
         let content;
         syn::parenthesized!(content in input);
-        let fn_args: Punctuated<FnArg, Token![,]> = content.parse_terminated(FnArg::parse)?;
+        let fn_args = content.parse_terminated(FnArg::parse, Token![,])?;
         let fn_args = fn_args.into_iter().collect();
 
         input.parse::<Token![,]>()?;

core/codegen/src/derive/from_form.rs

@@ -73,7 +73,7 @@ fn context_type(input: Input<'_>) -> Result<(TokenStream, syn::Generics)> {
 
     let lifetime = syn::parse_quote!('r);
     if !gen.replace_lifetime(0, &lifetime) {
-        gen.insert_lifetime(syn::LifetimeDef::new(lifetime.clone()));
+        gen.insert_lifetime(syn::LifetimeParam::new(lifetime.clone()));
     }
 
     gen.add_where_predicates(generic_bounds(input)?);

core/codegen/src/derive/uri_display.rs

@@ -39,7 +39,7 @@ pub fn derive_uri_display_query(input: proc_macro::TokenStream) -> TokenStream {
         .validator(ValidatorBuild::new()
             .enum_validate(|_, data| {
                 if data.variants().count() == 0 {
-                    Err(data.brace_token.span.error(NO_EMPTY_ENUMS))
+                    Err(data.brace_token.span.join().error(NO_EMPTY_ENUMS))
                 } else {
                     Ok(())
                 }

core/codegen/tests/ui-fail-nightly/typed-uris-bad-params.stderr

@@ -1,4 +1,4 @@
-error: expected identifier
+error: expected identifier, found keyword `_`
   --> tests/ui-fail-nightly/typed-uris-bad-params.rs:63:18
    |
 63 |     uri!(ignored(_ = 10));

core/codegen/tests/ui-fail-nightly/typed-uris-invalid-syntax.stderr

@@ -1,8 +1,8 @@
-error: expected identifier
+error: unexpected token
-  --> tests/ui-fail-nightly/typed-uris-invalid-syntax.rs:10:28
+  --> tests/ui-fail-nightly/typed-uris-invalid-syntax.rs:10:16
    |
 10 |     uri!(simple: id = 100, "Hello");
-   |                            ^^^^^^^
+   |                ^
 
 error: named and unnamed parameters cannot be mixed
   --> tests/ui-fail-nightly/typed-uris-invalid-syntax.rs:11:17

core/codegen/tests/ui-fail-stable/from_form_field.stderr

@@ -1,11 +1,11 @@
 error: tuple structs are not supported
- --> $DIR/from_form_field.rs:4:1
+ --> tests/ui-fail-stable/from_form_field.rs:4:1
   |
 4 | struct Foo1;
   | ^^^^^^
 
 error: [note] error occurred while deriving `FromFormField`
- --> $DIR/from_form_field.rs:3:10
+ --> tests/ui-fail-stable/from_form_field.rs:3:10
   |
 3 | #[derive(FromFormField)]
   |          ^^^^^^^^^^^^^
@@ -13,13 +13,13 @@ error: [note] error occurred while deriving `FromFormField`
   = note: this error originates in the derive macro `FromFormField` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: tuple structs are not supported
- --> $DIR/from_form_field.rs:7:1
+ --> tests/ui-fail-stable/from_form_field.rs:7:1
   |
 7 | struct Foo2(usize);
   | ^^^^^^
 
 error: [note] error occurred while deriving `FromFormField`
- --> $DIR/from_form_field.rs:6:10
+ --> tests/ui-fail-stable/from_form_field.rs:6:10
   |
 6 | #[derive(FromFormField)]
   |          ^^^^^^^^^^^^^
@@ -27,13 +27,13 @@ error: [note] error occurred while deriving `FromFormField`
   = note: this error originates in the derive macro `FromFormField` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: named structs are not supported
-  --> $DIR/from_form_field.rs:10:1
+  --> tests/ui-fail-stable/from_form_field.rs:10:1
    |
 10 | struct Foo3 {
    | ^^^^^^
 
 error: [note] error occurred while deriving `FromFormField`
- --> $DIR/from_form_field.rs:9:10
+ --> tests/ui-fail-stable/from_form_field.rs:9:10
   |
 9 | #[derive(FromFormField)]
   |          ^^^^^^^^^^^^^
@@ -41,13 +41,13 @@ error: [note] error occurred while deriving `FromFormField`
   = note: this error originates in the derive macro `FromFormField` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: variants cannot have fields
-  --> $DIR/from_form_field.rs:16:6
+  --> tests/ui-fail-stable/from_form_field.rs:16:6
    |
 16 |     A(usize),
    |      ^^^^^^^
 
 error: [note] error occurred while deriving `FromFormField`
-  --> $DIR/from_form_field.rs:14:10
+  --> tests/ui-fail-stable/from_form_field.rs:14:10
    |
 14 | #[derive(FromFormField)]
    |          ^^^^^^^^^^^^^
@@ -55,13 +55,13 @@ error: [note] error occurred while deriving `FromFormField`
    = note: this error originates in the derive macro `FromFormField` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: enum must have at least one variant
-  --> $DIR/from_form_field.rs:20:1
+  --> tests/ui-fail-stable/from_form_field.rs:20:1
    |
 20 | enum Foo5 { }
    | ^^^^
 
 error: [note] error occurred while deriving `FromFormField`
-  --> $DIR/from_form_field.rs:19:10
+  --> tests/ui-fail-stable/from_form_field.rs:19:10
    |
 19 | #[derive(FromFormField)]
    |          ^^^^^^^^^^^^^
@@ -69,13 +69,13 @@ error: [note] error occurred while deriving `FromFormField`
    = note: this error originates in the derive macro `FromFormField` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: type generics are not supported
-  --> $DIR/from_form_field.rs:23:11
+  --> tests/ui-fail-stable/from_form_field.rs:23:11
    |
 23 | enum Foo6<T> {
    |           ^
 
 error: [note] error occurred while deriving `FromFormField`
-  --> $DIR/from_form_field.rs:22:10
+  --> tests/ui-fail-stable/from_form_field.rs:22:10
    |
 22 | #[derive(FromFormField)]
    |          ^^^^^^^^^^^^^
@@ -83,13 +83,13 @@ error: [note] error occurred while deriving `FromFormField`
    = note: this error originates in the derive macro `FromFormField` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: invalid value: expected string literal
-  --> $DIR/from_form_field.rs:29:21
+  --> tests/ui-fail-stable/from_form_field.rs:29:21
    |
 29 |     #[field(value = 123)]
    |                     ^^^
 
 error: [note] error occurred while deriving `FromFormField`
-  --> $DIR/from_form_field.rs:27:10
+  --> tests/ui-fail-stable/from_form_field.rs:27:10
    |
 27 | #[derive(FromFormField)]
    |          ^^^^^^^^^^^^^
@@ -97,13 +97,13 @@ error: [note] error occurred while deriving `FromFormField`
    = note: this error originates in the derive macro `FromFormField` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: expected literal, found bare path "value"
-  --> $DIR/from_form_field.rs:35:13
+  --> tests/ui-fail-stable/from_form_field.rs:35:13
    |
 35 |     #[field(value)]
    |             ^^^^^
 
 error: [note] error occurred while deriving `FromFormField`
-  --> $DIR/from_form_field.rs:33:10
+  --> tests/ui-fail-stable/from_form_field.rs:33:10
    |
 33 | #[derive(FromFormField)]
    |          ^^^^^^^^^^^^^
@@ -111,25 +111,25 @@ error: [note] error occurred while deriving `FromFormField`
    = note: this error originates in the derive macro `FromFormField` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: variant has conflicting values
-  --> $DIR/from_form_field.rs:41:5
+  --> tests/ui-fail-stable/from_form_field.rs:41:5
    |
 41 |     #[field(value = "bar")]
    |     ^
 
 error: [note] this value...
-  --> $DIR/from_form_field.rs:41:21
+  --> tests/ui-fail-stable/from_form_field.rs:41:21
    |
 41 |     #[field(value = "bar")]
    |                     ^^^^^
 
 error: [note] ...conflicts with this value
-  --> $DIR/from_form_field.rs:42:21
+  --> tests/ui-fail-stable/from_form_field.rs:42:21
    |
 42 |     #[field(value = "bar")]
    |                     ^^^^^
 
 error: [note] error occurred while deriving `FromFormField`
-  --> $DIR/from_form_field.rs:39:10
+  --> tests/ui-fail-stable/from_form_field.rs:39:10
    |
 39 | #[derive(FromFormField)]
    |          ^^^^^^^^^^^^^
@@ -137,25 +137,25 @@ error: [note] error occurred while deriving `FromFormField`
    = note: this error originates in the derive macro `FromFormField` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: field value conflicts with previous value
-  --> $DIR/from_form_field.rs:50:21
+  --> tests/ui-fail-stable/from_form_field.rs:50:21
    |
 50 |     #[field(value = "BAr")]
    |                     ^^^^^
 
 error: [help] ...declared in this variant
-  --> $DIR/from_form_field.rs:50:5
+  --> tests/ui-fail-stable/from_form_field.rs:50:5
    |
 50 |     #[field(value = "BAr")]
    |     ^
 
 error: [note] previous field with conflicting name
-  --> $DIR/from_form_field.rs:48:5
+  --> tests/ui-fail-stable/from_form_field.rs:48:5
    |
 48 |     #[field(value = "bar")]
    |     ^
 
 error: [note] error occurred while deriving `FromFormField`
-  --> $DIR/from_form_field.rs:46:10
+  --> tests/ui-fail-stable/from_form_field.rs:46:10
    |
 46 | #[derive(FromFormField)]
    |          ^^^^^^^^^^^^^
@@ -163,25 +163,25 @@ error: [note] error occurred while deriving `FromFormField`
    = note: this error originates in the derive macro `FromFormField` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: field value conflicts with previous value
-  --> $DIR/from_form_field.rs:57:21
+  --> tests/ui-fail-stable/from_form_field.rs:57:21
    |
 57 |     #[field(value = "a")]
    |                     ^^^
 
 error: [help] ...declared in this variant
-  --> $DIR/from_form_field.rs:57:5
+  --> tests/ui-fail-stable/from_form_field.rs:57:5
    |
 57 |     #[field(value = "a")]
    |     ^
 
 error: [note] previous field with conflicting name
-  --> $DIR/from_form_field.rs:56:5
+  --> tests/ui-fail-stable/from_form_field.rs:56:5
    |
 56 |     A,
    |     ^
 
 error: [note] error occurred while deriving `FromFormField`
-  --> $DIR/from_form_field.rs:54:10
+  --> tests/ui-fail-stable/from_form_field.rs:54:10
    |
 54 | #[derive(FromFormField)]
    |          ^^^^^^^^^^^^^
@@ -189,25 +189,25 @@ error: [note] error occurred while deriving `FromFormField`
    = note: this error originates in the derive macro `FromFormField` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: variant has conflicting values
-  --> $DIR/from_form_field.rs:80:5
+  --> tests/ui-fail-stable/from_form_field.rs:80:5
    |
 80 |     #[field(value = "FoO")]
    |     ^
 
 error: [note] this value...
-  --> $DIR/from_form_field.rs:80:21
+  --> tests/ui-fail-stable/from_form_field.rs:80:21
    |
 80 |     #[field(value = "FoO")]
    |                     ^^^^^
 
 error: [note] ...conflicts with this value
-  --> $DIR/from_form_field.rs:81:21
+  --> tests/ui-fail-stable/from_form_field.rs:81:21
    |
 81 |     #[field(value = "foo")]
    |                     ^^^^^
 
 error: [note] error occurred while deriving `FromFormField`
-  --> $DIR/from_form_field.rs:78:10
+  --> tests/ui-fail-stable/from_form_field.rs:78:10
    |
 78 | #[derive(FromFormField)]
    |          ^^^^^^^^^^^^^
@@ -215,25 +215,25 @@ error: [note] error occurred while deriving `FromFormField`
    = note: this error originates in the derive macro `FromFormField` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: field has conflicting names
-  --> $DIR/from_form_field.rs:87:5
+  --> tests/ui-fail-stable/from_form_field.rs:87:5
    |
 87 |     #[field(name = "foo")]
    |     ^
 
 error: [note] this field name...
-  --> $DIR/from_form_field.rs:87:20
+  --> tests/ui-fail-stable/from_form_field.rs:87:20
    |
 87 |     #[field(name = "foo")]
    |                    ^^^^^
 
 error: [note] ...conflicts with this field name
-  --> $DIR/from_form_field.rs:88:28
+  --> tests/ui-fail-stable/from_form_field.rs:88:28
    |
 88 |     #[field(name = uncased("FOO"))]
    |                            ^^^^^
 
 error: [note] error occurred while deriving `FromForm`
-  --> $DIR/from_form_field.rs:85:10
+  --> tests/ui-fail-stable/from_form_field.rs:85:10
    |
 85 | #[derive(FromForm)]
    |          ^^^^^^^^
@@ -241,25 +241,25 @@ error: [note] error occurred while deriving `FromForm`
    = note: this error originates in the derive macro `FromForm` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: field name conflicts with previous name
-  --> $DIR/from_form_field.rs:96:20
+  --> tests/ui-fail-stable/from_form_field.rs:96:20
    |
 96 |     #[field(name = "foo")]
    |                    ^^^^^
 
 error: [help] declared in this field
-  --> $DIR/from_form_field.rs:96:5
+  --> tests/ui-fail-stable/from_form_field.rs:96:5
    |
 96 |     #[field(name = "foo")]
    |     ^
 
 error: [note] previous field with conflicting name
-  --> $DIR/from_form_field.rs:94:5
+  --> tests/ui-fail-stable/from_form_field.rs:94:5
    |
 94 |     #[field(name = "foo")]
    |     ^
 
 error: [note] error occurred while deriving `FromForm`
-  --> $DIR/from_form_field.rs:92:10
+  --> tests/ui-fail-stable/from_form_field.rs:92:10
    |
 92 | #[derive(FromForm)]
    |          ^^^^^^^^
@@ -267,25 +267,25 @@ error: [note] error occurred while deriving `FromForm`
    = note: this error originates in the derive macro `FromForm` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: field name conflicts with previous name
-   --> $DIR/from_form_field.rs:104:5
+   --> tests/ui-fail-stable/from_form_field.rs:104:5
     |
 104 |     hello_there: usize,
     |     ^^^^^^^^^^^
 
 error: [help] declared in this field
-   --> $DIR/from_form_field.rs:104:5
+   --> tests/ui-fail-stable/from_form_field.rs:104:5
     |
 104 |     hello_there: usize,
     |     ^^^^^^^^^^^
 
 error: [note] previous field with conflicting name
-   --> $DIR/from_form_field.rs:102:5
+   --> tests/ui-fail-stable/from_form_field.rs:102:5
     |
 102 |     #[field(name = uncased("HELLO_THERE"))]
     |     ^
 
 error: [note] error occurred while deriving `FromForm`
-   --> $DIR/from_form_field.rs:100:10
+   --> tests/ui-fail-stable/from_form_field.rs:100:10
     |
 100 | #[derive(FromForm)]
     |          ^^^^^^^^
@@ -293,25 +293,25 @@ error: [note] error occurred while deriving `FromForm`
     = note: this error originates in the derive macro `FromForm` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: field name conflicts with previous name
-   --> $DIR/from_form_field.rs:111:5
+   --> tests/ui-fail-stable/from_form_field.rs:111:5
     |
 111 |     hello_there: usize,
     |     ^^^^^^^^^^^
 
 error: [help] declared in this field
-   --> $DIR/from_form_field.rs:111:5
+   --> tests/ui-fail-stable/from_form_field.rs:111:5
     |
 111 |     hello_there: usize,
     |     ^^^^^^^^^^^
 
 error: [note] previous field with conflicting name
-   --> $DIR/from_form_field.rs:109:5
+   --> tests/ui-fail-stable/from_form_field.rs:109:5
     |
 109 |     #[field(name = "hello_there")]
     |     ^
 
 error: [note] error occurred while deriving `FromForm`
-   --> $DIR/from_form_field.rs:107:10
+   --> tests/ui-fail-stable/from_form_field.rs:107:10
     |
 107 | #[derive(FromForm)]
     |          ^^^^^^^^

core/codegen/tests/ui-fail-stable/typed-uris-bad-params.stderr

@@ -1,4 +1,4 @@
-error: expected identifier
+error: expected identifier, found keyword `_`
   --> tests/ui-fail-stable/typed-uris-bad-params.rs:63:18
    |
 63 |     uri!(ignored(_ = 10));

core/codegen/tests/ui-fail-stable/typed-uris-invalid-syntax.stderr

@@ -1,8 +1,8 @@
-error: expected identifier
+error: unexpected token
-  --> tests/ui-fail-stable/typed-uris-invalid-syntax.rs:10:28
+  --> tests/ui-fail-stable/typed-uris-invalid-syntax.rs:10:16
    |
 10 |     uri!(simple: id = 100, "Hello");
-   |                            ^^^^^^^
+   |                ^
 
 error: named and unnamed parameters cannot be mixed
   --> tests/ui-fail-stable/typed-uris-invalid-syntax.rs:11:17