Auto merge of #77255 - Aaron1011:feature/collect-attr-tokens, r=petrochenkov

Unconditionally capture tokens for attributes.

This allows us to avoid synthesizing tokens in `prepend_attr`, since we
have the original tokens available.

We still need to synthesize tokens when expanding `cfg_attr`,
but this is an unavoidable consequence of the syntax of `cfg_attr` -
the user does not supply the `#` and `[]` tokens that a `cfg_attr`
expands to.

This is based on PR https://github.com/rust-lang/rust/pull/77250 - this PR exposes a bug in the current `collect_tokens` implementation, which is fixed by the rewrite.

3 files changed, 10 insertions, 10 deletions

diff --git a/src/test/ui/ast-json/ast-json-noexpand-output.stdout b/src/test/ui/ast-json/ast-json-noexpand-output.stdout
index 3d7d476cf6c..259206ba907 100644
--- a/src/test/ui/ast-json/ast-json-noexpand-output.stdout
+++ b/src/test/ui/ast-json/ast-json-noexpand-output.stdout
@@ -1 +1 @@
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diff --git a/src/test/ui/ast-json/ast-json-output.stdout b/src/test/ui/ast-json/ast-json-output.stdout
index a4ce6061b4c..76e32044add 100644
--- a/src/test/ui/ast-json/ast-json-output.stdout
+++ b/src/test/ui/ast-json/ast-json-output.stdout
@@ -1 +1 @@
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diff --git a/src/test/ui/proc-macro/issue-75930-derive-cfg.stdout b/src/test/ui/proc-macro/issue-75930-derive-cfg.stdout
index f3daa56a49c..4c0810217bf 100644
--- a/src/test/ui/proc-macro/issue-75930-derive-cfg.stdout
+++ b/src/test/ui/proc-macro/issue-75930-derive-cfg.stdout
@@ -26,7 +26,7 @@ PRINT-ATTR INPUT (DEBUG): TokenStream [
     Punct {
         ch: '#',
         spacing: Alone,
-        span: $DIR/issue-75930-derive-cfg.rs:17:24: 17:40 (#0),
+        span: $DIR/issue-75930-derive-cfg.rs:17:1: 17:2 (#0),
     },
     Group {
         delimiter: Bracket,
@@ -46,12 +46,12 @@ PRINT-ATTR INPUT (DEBUG): TokenStream [
                 span: $DIR/issue-75930-derive-cfg.rs:17:29: 17:40 (#0),
             },
         ],
-        span: $DIR/issue-75930-derive-cfg.rs:17:24: 17:40 (#0),
+        span: $DIR/issue-75930-derive-cfg.rs:17:1: 17:2 (#0),
     },
     Punct {
         ch: '#',
         spacing: Alone,
-        span: $DIR/issue-75930-derive-cfg.rs:19:1: 19:17 (#0),
+        span: $DIR/issue-75930-derive-cfg.rs:19:1: 19:2 (#0),
     },
     Group {
         delimiter: Bracket,
@@ -71,12 +71,12 @@ PRINT-ATTR INPUT (DEBUG): TokenStream [
                 span: $DIR/issue-75930-derive-cfg.rs:19:9: 19:16 (#0),
             },
         ],
-        span: $DIR/issue-75930-derive-cfg.rs:19:1: 19:17 (#0),
+        span: $DIR/issue-75930-derive-cfg.rs:19:2: 19:17 (#0),
     },
     Punct {
         ch: '#',
         spacing: Alone,
-        span: $DIR/issue-75930-derive-cfg.rs:20:1: 20:19 (#0),
+        span: $DIR/issue-75930-derive-cfg.rs:20:1: 20:2 (#0),
     },
     Group {
         delimiter: Bracket,
@@ -96,12 +96,12 @@ PRINT-ATTR INPUT (DEBUG): TokenStream [
                 span: $DIR/issue-75930-derive-cfg.rs:20:15: 20:18 (#0),
             },
         ],
-        span: $DIR/issue-75930-derive-cfg.rs:20:1: 20:19 (#0),
+        span: $DIR/issue-75930-derive-cfg.rs:20:2: 20:19 (#0),
     },
     Punct {
         ch: '#',
         spacing: Alone,
-        span: $DIR/issue-75930-derive-cfg.rs:16:1: 16:19 (#0),
+        span: $DIR/issue-75930-derive-cfg.rs:16:1: 16:2 (#0),
     },
     Group {
         delimiter: Bracket,
@@ -121,7 +121,7 @@ PRINT-ATTR INPUT (DEBUG): TokenStream [
                 span: $DIR/issue-75930-derive-cfg.rs:16:15: 16:18 (#0),
             },
         ],
-        span: $DIR/issue-75930-derive-cfg.rs:16:1: 16:19 (#0),
+        span: $DIR/issue-75930-derive-cfg.rs:16:2: 16:19 (#0),
     },
     Ident {
         ident: "struct",