Test legacy mangling of bool, char and integer constants

The existing v0 tests have been slightly adjusted for compatibility with
legacy mangler, which requires an item to have an ancestor in a value
namespace or a type namespace to produce a symbol for it. In v0 mangling
this results in an extra `Nv` component.

src/test/ui/symbol-names/const-generics-demangling.legacy.stderr

+error: symbol-name(_ZN1c21Unsigned$LT$11_u8$GT$1f17h[HASH]E)
+  --> $DIR/const-generics-demangling.rs:13:5
+   |
+LL |     #[rustc_symbol_name]
+   |     ^^^^^^^^^^^^^^^^^^^^
+
+error: demangling(c::Unsigned<11_u8>::f::h[HASH])
+  --> $DIR/const-generics-demangling.rs:13:5
+   |
+LL |     #[rustc_symbol_name]
+   |     ^^^^^^^^^^^^^^^^^^^^
+
+error: demangling-alt(c::Unsigned<11_u8>::f)
+  --> $DIR/const-generics-demangling.rs:13:5
+   |
+LL |     #[rustc_symbol_name]
+   |     ^^^^^^^^^^^^^^^^^^^^
+
+error: symbol-name(_ZN1c22Signed$LT$.152_i16$GT$1f17h[HASH]E)
+  --> $DIR/const-generics-demangling.rs:26:5
+   |
+LL |     #[rustc_symbol_name]
+   |     ^^^^^^^^^^^^^^^^^^^^
+
+error: demangling(c::Signed<.152_i16>::f::h[HASH])
+  --> $DIR/const-generics-demangling.rs:26:5
+   |
+LL |     #[rustc_symbol_name]
+   |     ^^^^^^^^^^^^^^^^^^^^
+
+error: demangling-alt(c::Signed<.152_i16>::f)
+  --> $DIR/const-generics-demangling.rs:26:5
+   |
+LL |     #[rustc_symbol_name]
+   |     ^^^^^^^^^^^^^^^^^^^^
+
+error: symbol-name(_ZN1c13Bool$LT$_$GT$1f17h[HASH]E)
+  --> $DIR/const-generics-demangling.rs:39:5
+   |
+LL |     #[rustc_symbol_name]
+   |     ^^^^^^^^^^^^^^^^^^^^
+
+error: demangling(c::Bool<_>::f::h[HASH])
+  --> $DIR/const-generics-demangling.rs:39:5
+   |
+LL |     #[rustc_symbol_name]
+   |     ^^^^^^^^^^^^^^^^^^^^
+
+error: demangling-alt(c::Bool<_>::f)
+  --> $DIR/const-generics-demangling.rs:39:5
+   |
+LL |     #[rustc_symbol_name]
+   |     ^^^^^^^^^^^^^^^^^^^^
+
+error: symbol-name(_ZN1c13Char$LT$_$GT$1f17h[HASH]E)
+  --> $DIR/const-generics-demangling.rs:52:5
+   |
+LL |     #[rustc_symbol_name]
+   |     ^^^^^^^^^^^^^^^^^^^^
+
+error: demangling(c::Char<_>::f::h[HASH])
+  --> $DIR/const-generics-demangling.rs:52:5
+   |
+LL |     #[rustc_symbol_name]
+   |     ^^^^^^^^^^^^^^^^^^^^
+
+error: demangling-alt(c::Char<_>::f)
+  --> $DIR/const-generics-demangling.rs:52:5
+   |
+LL |     #[rustc_symbol_name]
+   |     ^^^^^^^^^^^^^^^^^^^^
+
+error: aborting due to 12 previous errors
+

src/test/ui/symbol-names/const-generics-demangling.rs

 // build-fail
-// compile-flags: -C symbol-mangling-version=v0 --crate-name=c
-// normalize-stderr-test: "c\[.*?\]" -> "c[HASH]"
+// revisions: legacy v0
+// compile-flags: --crate-name=c
+//[legacy]compile-flags: -C symbol-mangling-version=legacy -Z unstable-options
+//    [v0]compile-flags: -C symbol-mangling-version=v0
+//[legacy]normalize-stderr-test: "h[[:xdigit:]]{16}" -> "h[HASH]"
+//    [v0]normalize-stderr-test: "c\[.*?\]" -> "c[HASH]"
 #![feature(rustc_attrs)]
 
 pub struct Unsigned<const F: u8>;
 
-#[rustc_symbol_name]
-//~^ ERROR symbol-name(_RMCs
-//~| ERROR demangling(<c[
-//~| ERROR demangling-alt(<c::Unsigned<11>>)
-impl Unsigned<11> {}
+impl Unsigned<11> {
+    #[rustc_symbol_name]
+    //[v0]~^ ERROR symbol-name(_RNvMCs
+    //[v0]~| ERROR demangling(<c[
+    //[v0]~| ERROR demangling-alt(<c::Unsigned<11>>::f)
+    //[legacy]~^^^^ ERROR symbol-name(_ZN1c21Unsigned$LT$11_u8$GT$
+    //[legacy]~|    ERROR demangling(c::Unsigned<11_u8>::f::
+    //[legacy]~|    ERROR demangling-alt(c::Unsigned<11_u8>::f)
+    fn f() {}
+}
 
 pub struct Signed<const F: i16>;
 
-#[rustc_symbol_name]
-//~^ ERROR symbol-name(_RMs_Cs
-//~| ERROR demangling(<c[
-//~| ERROR demangling-alt(<c::Signed<-152>>)
-impl Signed<-152> {}
+impl Signed<-152> {
+    #[rustc_symbol_name]
+    //[v0]~^ ERROR symbol-name(_RNvMs_Cs
+    //[v0]~| ERROR demangling(<c[
+    //[v0]~| ERROR demangling-alt(<c::Signed<-152>>::f)
+    //[legacy]~^^^^ ERROR symbol-name(_ZN1c22Signed$LT$.152_i16$GT$
+    //[legacy]~|    ERROR demangling(c::Signed<.152_i16>::f::
+    //[legacy]~|    ERROR demangling-alt(c::Signed<.152_i16>::f)
+    fn f() {}
+}
 
 pub struct Bool<const F: bool>;
 
-#[rustc_symbol_name]
-//~^ ERROR symbol-name(_RMs0_Cs
-//~| ERROR demangling(<c[
-//~| ERROR demangling-alt(<c::Bool<true>>)
-impl Bool<true> {}
+impl Bool<true> {
+    #[rustc_symbol_name]
+    //[v0]~^ ERROR symbol-name(_RNvMs0_Cs
+    //[v0]~| ERROR demangling(<c[
+    //[v0]~| ERROR demangling-alt(<c::Bool<true>>::f)
+    //[legacy]~^^^^ ERROR symbol-name(_ZN1c13Bool$LT$_$GT$
+    //[legacy]~|    ERROR demangling(c::Bool<_>::f::
+    //[legacy]~|    ERROR demangling-alt(c::Bool<_>::f)
+    fn f() {}
+}
 
 pub struct Char<const F: char>;
 
-#[rustc_symbol_name]
-//~^ ERROR symbol-name(_RMs1_Cs
-//~| ERROR demangling(<c[
-//~| ERROR demangling-alt(<c::Char<'∂'>>)
-impl Char<'∂'> {}
+impl Char<'∂'> {
+    #[rustc_symbol_name]
+    //[v0]~^ ERROR symbol-name(_RNvMs1_Cs
+    //[v0]~| ERROR demangling(<c[
+    //[v0]~| ERROR demangling-alt(<c::Char<'∂'>>::f)
+    //[legacy]~^^^^ ERROR symbol-name(_ZN1c13Char$LT$_$GT$
+    //[legacy]~|    ERROR demangling(c::Char<_>::f::
+    //[legacy]~|    ERROR demangling-alt(c::Char<_>::f)
+    fn f() {}
+}
 
 fn main() {}

src/test/ui/symbol-names/const-generics-demangling.stderr

-error: symbol-name(_RMCsCRATE_HASH_1cINtB<REF>_8UnsignedKhb_E)
-  --> $DIR/const-generics-demangling.rs:8:1
-   |
-LL | #[rustc_symbol_name]
-   | ^^^^^^^^^^^^^^^^^^^^
-
-error: demangling(<c[HASH]::Unsigned<11u8>>)
-  --> $DIR/const-generics-demangling.rs:8:1
-   |
-LL | #[rustc_symbol_name]
-   | ^^^^^^^^^^^^^^^^^^^^
-
-error: demangling-alt(<c::Unsigned<11>>)
-  --> $DIR/const-generics-demangling.rs:8:1
-   |
-LL | #[rustc_symbol_name]
-   | ^^^^^^^^^^^^^^^^^^^^
-
-error: symbol-name(_RMs_CsCRATE_HASH_1cINtB<REF>_6SignedKsn98_E)
-  --> $DIR/const-generics-demangling.rs:16:1
-   |
-LL | #[rustc_symbol_name]
-   | ^^^^^^^^^^^^^^^^^^^^
-
-error: demangling(<c[HASH]::Signed<-152i16>>)
-  --> $DIR/const-generics-demangling.rs:16:1
-   |
-LL | #[rustc_symbol_name]
-   | ^^^^^^^^^^^^^^^^^^^^
-
-error: demangling-alt(<c::Signed<-152>>)
-  --> $DIR/const-generics-demangling.rs:16:1
-   |
-LL | #[rustc_symbol_name]
-   | ^^^^^^^^^^^^^^^^^^^^
-
-error: symbol-name(_RMs0_CsCRATE_HASH_1cINtB<REF>_4BoolKb1_E)
-  --> $DIR/const-generics-demangling.rs:24:1
-   |
-LL | #[rustc_symbol_name]
-   | ^^^^^^^^^^^^^^^^^^^^
-
-error: demangling(<c[HASH]::Bool<true>>)
-  --> $DIR/const-generics-demangling.rs:24:1
-   |
-LL | #[rustc_symbol_name]
-   | ^^^^^^^^^^^^^^^^^^^^
-
-error: demangling-alt(<c::Bool<true>>)
-  --> $DIR/const-generics-demangling.rs:24:1
-   |
-LL | #[rustc_symbol_name]
-   | ^^^^^^^^^^^^^^^^^^^^
-
-error: symbol-name(_RMs1_CsCRATE_HASH_1cINtB<REF>_4CharKc2202_E)
-  --> $DIR/const-generics-demangling.rs:32:1
-   |
-LL | #[rustc_symbol_name]
-   | ^^^^^^^^^^^^^^^^^^^^
-
-error: demangling(<c[HASH]::Char<'∂'>>)
-  --> $DIR/const-generics-demangling.rs:32:1
-   |
-LL | #[rustc_symbol_name]
-   | ^^^^^^^^^^^^^^^^^^^^
-
-error: demangling-alt(<c::Char<'∂'>>)
-  --> $DIR/const-generics-demangling.rs:32:1
-   |
-LL | #[rustc_symbol_name]
-   | ^^^^^^^^^^^^^^^^^^^^
-
-error: aborting due to 12 previous errors
-

src/test/ui/symbol-names/const-generics-demangling.v0.stderr

+error: symbol-name(_RNvMCsCRATE_HASH_1cINtB<REF>_8UnsignedKhb_E1f)
+  --> $DIR/const-generics-demangling.rs:13:5
+   |
+LL |     #[rustc_symbol_name]
+   |     ^^^^^^^^^^^^^^^^^^^^
+
+error: demangling(<c[HASH]::Unsigned<11u8>>::f)
+  --> $DIR/const-generics-demangling.rs:13:5
+   |
+LL |     #[rustc_symbol_name]
+   |     ^^^^^^^^^^^^^^^^^^^^
+
+error: demangling-alt(<c::Unsigned<11>>::f)
+  --> $DIR/const-generics-demangling.rs:13:5
+   |
+LL |     #[rustc_symbol_name]
+   |     ^^^^^^^^^^^^^^^^^^^^
+
+error: symbol-name(_RNvMs_CsCRATE_HASH_1cINtB<REF>_6SignedKsn98_E1f)
+  --> $DIR/const-generics-demangling.rs:26:5
+   |
+LL |     #[rustc_symbol_name]
+   |     ^^^^^^^^^^^^^^^^^^^^
+
+error: demangling(<c[HASH]::Signed<-152i16>>::f)
+  --> $DIR/const-generics-demangling.rs:26:5
+   |
+LL |     #[rustc_symbol_name]
+   |     ^^^^^^^^^^^^^^^^^^^^
+
+error: demangling-alt(<c::Signed<-152>>::f)
+  --> $DIR/const-generics-demangling.rs:26:5
+   |
+LL |     #[rustc_symbol_name]
+   |     ^^^^^^^^^^^^^^^^^^^^
+
+error: symbol-name(_RNvMs0_CsCRATE_HASH_1cINtB<REF>_4BoolKb1_E1f)
+  --> $DIR/const-generics-demangling.rs:39:5
+   |
+LL |     #[rustc_symbol_name]
+   |     ^^^^^^^^^^^^^^^^^^^^
+
+error: demangling(<c[HASH]::Bool<true>>::f)
+  --> $DIR/const-generics-demangling.rs:39:5
+   |
+LL |     #[rustc_symbol_name]
+   |     ^^^^^^^^^^^^^^^^^^^^
+
+error: demangling-alt(<c::Bool<true>>::f)
+  --> $DIR/const-generics-demangling.rs:39:5
+   |
+LL |     #[rustc_symbol_name]
+   |     ^^^^^^^^^^^^^^^^^^^^
+
+error: symbol-name(_RNvMs1_CsCRATE_HASH_1cINtB<REF>_4CharKc2202_E1f)
+  --> $DIR/const-generics-demangling.rs:52:5
+   |
+LL |     #[rustc_symbol_name]
+   |     ^^^^^^^^^^^^^^^^^^^^
+
+error: demangling(<c[HASH]::Char<'∂'>>::f)
+  --> $DIR/const-generics-demangling.rs:52:5
+   |
+LL |     #[rustc_symbol_name]
+   |     ^^^^^^^^^^^^^^^^^^^^
+
+error: demangling-alt(<c::Char<'∂'>>::f)
+  --> $DIR/const-generics-demangling.rs:52:5
+   |
+LL |     #[rustc_symbol_name]
+   |     ^^^^^^^^^^^^^^^^^^^^
+
+error: aborting due to 12 previous errors
+