Unify single-char and multi-char CStrUnit::Char handling.

nnethercote · nnethercote · commit a50efe265309 · 2023-12-13T10:06:13.000+11:00
The two cases are equivalent. C string literals aren't common so there
is no performance need here.
diff --git a/compiler/rustc_ast/src/util/literal.rs b/compiler/rustc_ast/src/util/literal.rs
@@ -161,7 +161,6 @@ impl LitKind {
                         error = Err(LitError::NulInCStr(span));
                     }
                     Ok(CStrUnit::Byte(b)) => buf.push(b),
-                    Ok(CStrUnit::Char(c)) if c.len_utf8() == 1 => buf.push(c as u8),
                     Ok(CStrUnit::Char(c)) => {
                         buf.extend_from_slice(c.encode_utf8(&mut [0; 4]).as_bytes())
                     }

Original file line number	Diff line number	Diff line change
`@@ -161,7 +161,6 @@ impl LitKind {`
`161`	`161`	`error = Err(LitError::NulInCStr(span));`
`162`	`162`	`}`
`163`	`163`	`Ok(CStrUnit::Byte(b)) => buf.push(b),`
`164`		`- Ok(CStrUnit::Char(c)) if c.len_utf8() == 1 => buf.push(c as u8),`
`165`	`164`	`Ok(CStrUnit::Char(c)) => {`
`166`	`165`	`buf.extend_from_slice(c.encode_utf8(&mut [0; 4]).as_bytes())`
`167`	`166`	`}`