Fix CI, again.

build.rs

@@ -37,14 +37,5 @@ mod codegen {
 }
 
 fn main() {
-    if std::mem::size_of::<Option<bool>>() == 1 {
-        // https://github.com/rust-lang/rust/pull/45225
-        println!("cargo:rustc-cfg=rustc_has_pr45225")
-    }
-
-    if std::mem::size_of::<std::borrow::Cow<'static, str>>() == 24 {
-        println!("cargo:rustc-cfg=rustc_has_better_cow_layout")
-    }
-
     codegen::main();
 }

src/size_of_tests.rs

@@ -4,62 +4,49 @@
 
 use crate::cow_rc_str::CowRcStr;
 use crate::tokenizer::Token;
-use std::borrow::Cow;
 
 macro_rules! size_of_test {
-    ($testname: ident, $t: ty, $expected_size: expr) => {
+    ($testname: ident, $t: ty, $expected_min_size: expr, $expected_max_size: expr) => {
         #[test]
         fn $testname() {
             let new = ::std::mem::size_of::<$t>();
-            let old = $expected_size;
-            if new < old {
+            if new < $expected_min_size {
                 panic!(
                     "Your changes have decreased the stack size of {} from {} to {}. \
                      Good work! Please update the expected size in {}.",
                     stringify!($t),
-                    old,
+                    $expected_min_size,
                     new,
                     file!()
                 )
-            } else if new > old {
+            } else if new > $expected_max_size {
                 panic!(
                     "Your changes have increased the stack size of {} from {} to {}. \
                      Please consider choosing a design which avoids this increase. \
                      If you feel that the increase is necessary, update the size in {}.",
                     stringify!($t),
-                    old,
+                    $expected_max_size,
                     new,
                     file!()
                 )
             }
         }
     };
+    ($testname: ident, $t: ty, $expected_size: expr) => {
+        size_of_test!($testname, $t, $expected_size, $expected_size);
+    };
 }
 
 // Some of these assume 64-bit
 size_of_test!(token, Token, 32);
-size_of_test!(std_cow_str, Cow<'static, str>, if cfg!(rustc_has_better_cow_layout) { 24 } else { 32 });
+size_of_test!(std_cow_str, std::borrow::Cow<'static, str>, 24, 32);
 size_of_test!(cow_rc_str, CowRcStr, 16);
 
 size_of_test!(tokenizer, crate::tokenizer::Tokenizer, 72);
-size_of_test!(
-    parser_input,
-    crate::parser::ParserInput,
-    if cfg!(rustc_has_pr45225) { 136 } else { 144 }
-);
+size_of_test!(parser_input, crate::parser::ParserInput, 136);
 size_of_test!(parser, crate::parser::Parser, 16);
 size_of_test!(source_position, crate::SourcePosition, 8);
 size_of_test!(parser_state, crate::ParserState, 24);
 
-size_of_test!(basic_parse_error, crate::BasicParseError, if cfg!(rustc_has_better_cow_layout) { 40 } else { 48 });
-size_of_test!(
-    parse_error_lower_bound,
-    crate::ParseError<()>,
-    if cfg!(rustc_has_better_cow_layout) {
-        40
-    } else if cfg!(rustc_has_pr45225) {
-        48
-    } else {
-        56
-    }
-);
+size_of_test!(basic_parse_error, crate::BasicParseError, 40, 48);
+size_of_test!(parse_error_lower_bound, crate::ParseError<()>, 40, 48);