Avoid more platform dependent errors in UI tests.

core/codegen/tests/ui-fail-nightly/from_form.stderr

@@ -477,23 +477,21 @@ note: function defined here
     | pub fn ext<'v>(file: &TempFile<'_>, r#type: ContentType) -> Result<'v, ()> {
     |        ^^^
 
-error[E0277]: the trait bound `usize: From<&str>` is not satisfied
+error[E0308]: mismatched types
    --> tests/ui-fail-nightly/from_form.rs:171:23
     |
-171 |     #[field(default = "no conversion")]
-    |                       ^^^^^^^^^^^^^^^ the trait `From<&str>` is not implemented for `usize`
+171 |     #[field(default = 123)]
+    |                       ^^^
+    |                       |
+    |                       expected struct `std::string::String`, found integer
+    |                       arguments to this enum variant are incorrect
     |
-    = help: the following other types implement trait `From<T>`:
-              <f32 as From<i16>>
-              <f32 as From<i8>>
-              <f32 as From<u16>>
-              <f32 as From<u8>>
-              <f64 as From<f32>>
-              <f64 as From<i16>>
-              <f64 as From<i32>>
-              <f64 as From<i8>>
-            and 85 others
-    = note: required because of the requirements on the impl of `Into<usize>` for `&str`
+help: try using a conversion method
+    |
+171 |     #[field(default = 123.to_string())]
+    |                          ++++++++++++
+171 |     #[field(default = 123.to_string())]
+    |                          ++++++++++++
 
 error[E0308]: mismatched types
    --> tests/ui-fail-nightly/from_form.rs:203:33
@@ -509,3 +507,12 @@ help: try using a conversion method
     |                                     ++++++++++++
 203 |     #[field(default_with = Some("hi".to_string()))]
     |                                     ++++++++++++
+
+error[E0277]: the trait bound `bool: From<&str>` is not satisfied
+   --> tests/ui-fail-nightly/from_form.rs:209:23
+    |
+209 |     #[field(default = "no conversion")]
+    |                       ^^^^^^^^^^^^^^^ the trait `From<&str>` is not implemented for `bool`
+    |
+    = help: the trait `From<subtle::Choice>` is implemented for `bool`
+    = note: required because of the requirements on the impl of `Into<bool>` for `&str`

core/codegen/tests/ui-fail-stable/from_form.stderr

@@ -501,19 +501,18 @@ error[E0308]: mismatched types
 165 |     #[field(validate = ext("hello"))]
     |                            ^^^^^^^ expected struct `ContentType`, found `&str`
 
-error[E0277]: the trait bound `usize: From<&str>` is not satisfied
+error[E0308]: mismatched types
    --> tests/ui-fail-stable/from_form.rs:171:23
     |
-171 |     #[field(default = "no conversion")]
-    |                       ^^^^^^^^^^^^^^^ the trait `From<&str>` is not implemented for `usize`
+171 |     #[field(default = 123)]
+    |                       ^^^ expected struct `std::string::String`, found integer
     |
-    = help: the following implementations were found:
-              <usize as From<NonZeroUsize>>
-              <usize as From<bool>>
-              <usize as From<mio::token::Token>>
-              <usize as From<runtime::thread_pool::idle::State>>
-            and 89 others
-    = note: required because of the requirements on the impl of `Into<usize>` for `&str`
+help: try using a conversion method
+    |
+171 |     #[field(default = 123.to_string())]
+    |                          ++++++++++++
+171 |     #[field(default = 123.to_string())]
+    |                          ++++++++++++
 
 error[E0308]: mismatched types
    --> tests/ui-fail-stable/from_form.rs:203:33
@@ -527,3 +526,13 @@ help: try using a conversion method
     |                                     ++++++++++++
 203 |     #[field(default_with = Some("hi".to_string()))]
     |                                     ++++++++++++
+
+error[E0277]: the trait bound `bool: From<&str>` is not satisfied
+   --> tests/ui-fail-stable/from_form.rs:209:23
+    |
+209 |     #[field(default = "no conversion")]
+    |                       ^^^^^^^^^^^^^^^ the trait `From<&str>` is not implemented for `bool`
+    |
+    = help: the following implementations were found:
+              <bool as From<subtle::Choice>>
+    = note: required because of the requirements on the impl of `Into<bool>` for `&str`

core/codegen/tests/ui-fail/from_form.rs

@@ -168,8 +168,8 @@ struct Validate3 {
 
 #[derive(FromForm)]
 struct Default0 {
-    #[field(default = "no conversion")]
-    first: usize,
+    #[field(default = 123)]
+    first: String,
 }
 
 #[derive(FromForm)]
@@ -204,6 +204,12 @@ struct Default5 {
     no_conversion_from_with: String,
 }
 
+#[derive(FromForm)]
+struct Default6 {
+    #[field(default = "no conversion")]
+    first: bool,
+}
+
 #[derive(FromForm)] // NO ERROR
 struct Another<T> {
     _foo: T,