translate Rust unicode representation to C style unicode representation

Signed-off-by: Axel Nennker <axel.nennker@telekom.de>

src/bindgen/ir/constant.rs

@@ -151,7 +151,7 @@ impl Literal {
             syn::Expr::Lit(syn::ExprLit {
                 lit: syn::Lit::Char(ref value),
                 ..
-            }) => Ok(Literal::Expr(format!("'{}'", value.value().escape_default()))),
+            }) => Ok(Literal::Expr(format!("'{}'", value.value().escape_default().to_string().replace('{', "").replace('}', "")))),
             syn::Expr::Lit(syn::ExprLit {
                 lit: syn::Lit::Int(ref value),
                 ..

tests/expectations/both/constant.c

@@ -7,7 +7,7 @@
 
 #define FOO 10
 
-#define HEART '\u{2764}'
+#define HEART '\u2764'
 
 #define NEWLINE '\n'
 

tests/expectations/constant.c

@@ -7,7 +7,7 @@
 
 #define FOO 10
 
-#define HEART '\u{2764}'
+#define HEART '\u2764'
 
 #define NEWLINE '\n'
 

tests/expectations/constant.cpp

@@ -6,7 +6,7 @@ static const wchar_t DELIMITER = ':';
 
 static const int32_t FOO = 10;
 
-static const wchar_t HEART = '\u{2764}';
+static const wchar_t HEART = '\u2764';
 
 static const wchar_t NEWLINE = '\n';
 

tests/expectations/tag/constant.c

@@ -7,7 +7,7 @@
 
 #define FOO 10
 
-#define HEART '\u{2764}'
+#define HEART '\u2764'
 
 #define NEWLINE '\n'