add snapshot test for unary expression

Author: bungcip

c2rust-transpile/tests/snapshots/exprs.c

@@ -0,0 +1,35 @@
+int puts(const char *str);
+
+static int side_effect(){
+    puts("the return of side effect");
+    return 10;
+}
+
+void unary_without_side_effect(){
+    int i = 5;
+    -i;
+    +i;
+    ~i;
+    !i;
+    &i;
+    *&i;
+    i++;
+    i--;
+    --i;
+    ++i;
+}
+
+void unary_with_side_effect(){
+    char* arr[1] = {0};
+
+    -side_effect();
+    +side_effect();
+    ~side_effect();
+    !side_effect();
+    &""[side_effect()];
+    *arr[side_effect()];
+    ++arr[side_effect()];
+    --arr[side_effect()];
+    arr[side_effect()]++;
+    arr[side_effect()]--;
+}

c2rust-transpile/tests/snapshots/[email protected]

@@ -0,0 +1,60 @@
+---
+source: c2rust-transpile/tests/snapshots.rs
+expression: cat tests/snapshots/exprs.rs
+input_file: c2rust-transpile/tests/snapshots/exprs.c
+---
+#![allow(
+    dead_code,
+    mutable_transmutes,
+    non_camel_case_types,
+    non_snake_case,
+    non_upper_case_globals,
+    unused_assignments,
+    unused_mut
+)]
+extern "C" {
+    fn puts(str: *const std::ffi::c_char) -> std::ffi::c_int;
+}
+unsafe extern "C" fn side_effect() -> std::ffi::c_int {
+    puts(b"the return of side effect\0" as *const u8 as *const std::ffi::c_char);
+    return 10 as std::ffi::c_int;
+}
+#[no_mangle]
+pub unsafe extern "C" fn unary_without_side_effect() {
+    let mut i: std::ffi::c_int = 5 as std::ffi::c_int;
+    -i;
+    i;
+    !i;
+    (i == 0) as std::ffi::c_int;
+    &mut i;
+    i;
+    i += 1;
+    i;
+    i -= 1;
+    i;
+    i -= 1;
+    i;
+    i += 1;
+    i;
+}
+#[no_mangle]
+pub unsafe extern "C" fn unary_with_side_effect() {
+    let mut arr: [*mut std::ffi::c_char; 1] = [0 as *mut std::ffi::c_char];
+    -side_effect();
+    side_effect();
+    !side_effect();
+    (side_effect() == 0) as std::ffi::c_int;
+    &*(b"\0" as *const u8 as *const std::ffi::c_char).offset(::core::mem::transmute::<
+        unsafe extern "C" fn() -> std::ffi::c_int,
+        unsafe extern "C" fn() -> std::ffi::c_int,
+    >(side_effect)() as isize) as *const std::ffi::c_char;
+    *arr[side_effect() as usize];
+    arr[side_effect() as usize] = (arr[side_effect() as usize]).offset(1);
+    arr[side_effect() as usize];
+    arr[side_effect() as usize] = (arr[side_effect() as usize]).offset(-1);
+    arr[side_effect() as usize];
+    arr[side_effect() as usize] = (arr[side_effect() as usize]).offset(1);
+    arr[side_effect() as usize];
+    arr[side_effect() as usize] = (arr[side_effect() as usize]).offset(-1);
+    arr[side_effect() as usize];
+}