diff --git a/rust-version b/rust-version
index 6884c82e9..0c4fc2d5f 100644
--- a/rust-version
+++ b/rust-version
@@ -1 +1 @@
-a31c27a887b40df16ab9dfb8c9f7924636092509
+c58275e0369d09fc3959b8ba87dcbcbe73797465
diff --git a/src/diagnostics.md b/src/diagnostics.md
index 554bcfcf8..7e3da67d8 100644
--- a/src/diagnostics.md
+++ b/src/diagnostics.md
@@ -1018,12 +1018,13 @@ pub trait From<T>: Sized {
 ### Formatting
 
 The string literals are format strings that accept parameters wrapped in braces
-but positional and listed parameters and format specifiers are not accepted.
+but positional and listed parameters are not accepted.
 The following parameter names are valid:
 - `Self` and all generic parameters of the trait.
 - `This`: the name of the trait the attribute is on, without generics.
-- `Trait`: the name of the "sugared" trait.
-  See `TraitRefPrintSugared`.
+- `This:path`: the full path of the trait the attribute is on, with unresolved generics.
+- `This:resolved`: the full path of the trait the attribute is on, with resolved generics.
+Additionally, this will "sugar" the `Fn(...)` traits.
 - `ItemContext`: the kind of `hir::Node` we're in, things like `"an async block"`,
    `"a function"`, `"an async function"`, etc.
 
diff --git a/src/tests/compiletest.md b/src/tests/compiletest.md
index 7ffc9e301..36dc71a3a 100644
--- a/src/tests/compiletest.md
+++ b/src/tests/compiletest.md
@@ -346,17 +346,6 @@ See also the [codegen tests](#codegen-tests) for a similar set of tests.
 If you need to work with `#![no_std]` cross-compiling tests, consult the
 [`minicore` test auxiliary](./minicore.md) chapter.
 
-#### Conditional assembly tests based on instruction support
-
-Tests that depend on specific assembly instructions being available can use the
-`//@ needs-asm-mnemonic: <MNEMONIC>` directive.
-This will skip the test if the target backend does not support the specified instruction mnemonic.
-
-For example, a test that requires the `RET` instruction:
-```rust,ignore
-//@ needs-asm-mnemonic: RET
-```
-
 [`tests/assembly-llvm`]: https://github.com/rust-lang/rust/tree/HEAD/tests/assembly-llvm
 
 
diff --git a/src/tests/directives.md b/src/tests/directives.md
index d1b923edd..5dce2ad13 100644
--- a/src/tests/directives.md
+++ b/src/tests/directives.md
@@ -164,9 +164,10 @@ The following directives will check rustc build settings and target settings:
   For tests that cross-compile to explicit targets
   via `--target`, use `needs-llvm-components` instead to ensure the appropriate
   backend is available.
-- `needs-asm-mnemonic: <MNEMONIC>` — ignores if the target backend does not
-  support the specified assembly mnemonic (e.g., `RET`, `NOP`).
-  Only supported with the LLVM backend.
+- `needs-asm-ret` - ignores if the target does not have a `ret` instruction
+  in its assembly syntax. Most target architectures have this instruction,
+  making it handy for portable inline-assembly tests, but some architectures
+  (e.g. 32-bit ARM) do not have it.
 - `needs-profiler-runtime` — ignores the test if the profiler runtime was not
   enabled for the target (`build.profiler = true` in `bootstrap.toml`)
 - `needs-sanitizer-support` — ignores if the sanitizer support was not enabled