diff --git a/quicklog/tests/closure.rs b/quicklog/tests/closure.rs
index cbbc592..e3b5c03 100644
--- a/quicklog/tests/closure.rs
+++ b/quicklog/tests/closure.rs
@@ -1,6 +1,6 @@
 use quicklog::info;
 
-use crate::common::Something;
+use common::Something;
 
 mod common;
 
diff --git a/quicklog/tests/common/mod.rs b/quicklog/tests/common/mod.rs
index 8e03324..27f8b75 100644
--- a/quicklog/tests/common/mod.rs
+++ b/quicklog/tests/common/mod.rs
@@ -99,6 +99,7 @@ impl A {
     }
 }
 
+#[derive(Clone)]
 pub(crate) struct SerializeStruct {
     pub(crate) symbol: String,
 }
@@ -153,14 +154,24 @@ impl Serialize for BigStruct {
     }
 }
 
+pub(crate) struct SimpleStruct {
+    some_str: &'static str,
+}
+
+impl std::fmt::Display for SimpleStruct {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "{}", self.some_str)
+    }
+}
+
 #[macro_export]
 macro_rules! setup {
     () => {
         quicklog::init!();
         static mut VEC: Vec<String> = Vec::new();
-        let vec_flusher = unsafe { crate::common::VecFlusher::new(&mut VEC) };
+        let vec_flusher = unsafe { common::VecFlusher::new(&mut VEC) };
         quicklog::logger().use_flush(Box::new(vec_flusher));
-        quicklog::logger().use_formatter(Box::new(crate::common::TestFormatter::new()))
+        quicklog::logger().use_formatter(Box::new(common::TestFormatter::new()))
     };
 }
 
@@ -170,7 +181,7 @@ macro_rules! helper_assert {
     (@ $f:expr, $format_string:expr, $check_f:expr) => {
         $f;
         quicklog::flush!();
-        let output = unsafe { crate::common::from_log_lines(&VEC, $check_f) };
+        let output = unsafe { common::from_log_lines(&VEC, $check_f) };
         assert_eq!(output, vec![$format_string]);
         unsafe {
             let _ = &VEC.clear();
@@ -180,10 +191,10 @@ macro_rules! helper_assert {
 
 #[macro_export]
 macro_rules! assert_message_equal {
-    ($f:expr, $format_string:expr) => { helper_assert!(@ $f, $format_string, crate::common::message_from_log_line) };
+    ($f:expr, $format_string:expr) => { helper_assert!(@ $f, $format_string, common::message_from_log_line) };
 }
 
 #[macro_export]
 macro_rules! assert_message_with_level_equal {
-    ($f:expr, $format_string:expr) => { helper_assert!(@ $f, $format_string, crate::common::message_and_level_from_log_line) };
+    ($f:expr, $format_string:expr) => { helper_assert!(@ $f, $format_string, common::message_and_level_from_log_line) };
 }
diff --git a/quicklog/tests/eager.rs b/quicklog/tests/eager.rs
index b7527e4..0103cee 100644
--- a/quicklog/tests/eager.rs
+++ b/quicklog/tests/eager.rs
@@ -1,6 +1,6 @@
 use quicklog::info;
 
-use crate::common::Something;
+use common::Something;
 
 mod common;
 
diff --git a/quicklog/tests/failures/assigned_prefixed_arg_after_fmt_str.rs b/quicklog/tests/failures/assigned_prefixed_arg_after_fmt_str.rs
new file mode 100644
index 0000000..d983a4f
--- /dev/null
+++ b/quicklog/tests/failures/assigned_prefixed_arg_after_fmt_str.rs
@@ -0,0 +1,13 @@
+use quicklog::info;
+
+#[path = "../common/mod.rs"]
+mod common;
+
+use common::Something;
+
+fn main() {
+    let s1 = Something {
+        some_str: "Hello world 1",
+    };
+    info!(a = ?s1, "prefixed arg after fmt str: {b}", b = ?s1);
+}
diff --git a/quicklog/tests/failures/assigned_prefixed_arg_after_fmt_str.stderr b/quicklog/tests/failures/assigned_prefixed_arg_after_fmt_str.stderr
new file mode 100644
index 0000000..9565a7c
--- /dev/null
+++ b/quicklog/tests/failures/assigned_prefixed_arg_after_fmt_str.stderr
@@ -0,0 +1,5 @@
+error: expected an expression
+  --> tests/failures/assigned_prefixed_arg_after_fmt_str.rs:12:59
+   |
+12 |     info!(a = ?s1, "prefixed arg after fmt str: {b}", b = ?s1);
+   |                                                           ^
diff --git a/quicklog/tests/failures/prefixed_arg_after_fmt_str.rs b/quicklog/tests/failures/prefixed_arg_after_fmt_str.rs
new file mode 100644
index 0000000..812fb2d
--- /dev/null
+++ b/quicklog/tests/failures/prefixed_arg_after_fmt_str.rs
@@ -0,0 +1,13 @@
+use quicklog::info;
+
+#[path = "../common/mod.rs"]
+mod common;
+
+use common::Something;
+
+fn main() {
+    let s1 = Something {
+        some_str: "Hello world 1",
+    };
+    info!(a = ?s1, "prefixed arg after fmt str: {b}", ?s1);
+}
diff --git a/quicklog/tests/failures/prefixed_arg_after_fmt_str.stderr b/quicklog/tests/failures/prefixed_arg_after_fmt_str.stderr
new file mode 100644
index 0000000..202b617
--- /dev/null
+++ b/quicklog/tests/failures/prefixed_arg_after_fmt_str.stderr
@@ -0,0 +1,5 @@
+error: expected an expression
+  --> tests/failures/prefixed_arg_after_fmt_str.rs:12:55
+   |
+12 |     info!(a = ?s1, "prefixed arg after fmt str: {b}", ?s1);
+   |                                                       ^
diff --git a/quicklog/tests/failures/struct_missing_clone.rs b/quicklog/tests/failures/struct_missing_clone.rs
new file mode 100644
index 0000000..230d2d3
--- /dev/null
+++ b/quicklog/tests/failures/struct_missing_clone.rs
@@ -0,0 +1,13 @@
+use quicklog::info;
+
+#[path = "../common/mod.rs"]
+mod common;
+
+use common::SimpleStruct;
+
+fn main() {
+    let s1 = SimpleStruct {
+        some_str: "Hello world 1",
+    };
+    info!(s1, "struct does not implement Clone");
+}
diff --git a/quicklog/tests/failures/struct_missing_clone.stderr b/quicklog/tests/failures/struct_missing_clone.stderr
new file mode 100644
index 0000000..4020145
--- /dev/null
+++ b/quicklog/tests/failures/struct_missing_clone.stderr
@@ -0,0 +1,24 @@
+error[E0599]: the method `to_owned` exists for struct `SimpleStruct`, but its trait bounds were not satisfied
+  --> tests/failures/struct_missing_clone.rs:12:5
+   |
+12 |     info!(s1, "struct does not implement Clone");
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ method cannot be called on `SimpleStruct` due to unsatisfied trait bounds
+   |
+  ::: tests/failures/../common/mod.rs
+   |
+   | pub(crate) struct SimpleStruct {
+   | ------------------------------
+   | |
+   | method `to_owned` not found for this struct
+   | doesn't satisfy `SimpleStruct: Clone`
+   | doesn't satisfy `SimpleStruct: ToOwned`
+   |
+   = note: the following trait bounds were not satisfied:
+           `SimpleStruct: Clone`
+           which is required by `SimpleStruct: ToOwned`
+   = note: this error originates in the macro `info` (in Nightly builds, run with -Z macro-backtrace for more info)
+help: consider annotating `SimpleStruct` with `#[derive(Clone)]`
+  --> tests/failures/../common/mod.rs
+   |
+    + #[derive(Clone)]
+    |
diff --git a/quicklog/tests/failures/struct_missing_debug.rs b/quicklog/tests/failures/struct_missing_debug.rs
new file mode 100644
index 0000000..f991d2c
--- /dev/null
+++ b/quicklog/tests/failures/struct_missing_debug.rs
@@ -0,0 +1,13 @@
+use quicklog::info;
+
+#[path = "../common/mod.rs"]
+mod common;
+
+use common::SerializeStruct;
+
+fn main() {
+    let s1 = SerializeStruct {
+        symbol: "Hello world 1".to_string(),
+    };
+    info!(?s1, "struct does not implement Debug");
+}
diff --git a/quicklog/tests/failures/struct_missing_debug.stderr b/quicklog/tests/failures/struct_missing_debug.stderr
new file mode 100644
index 0000000..0cd7ac9
--- /dev/null
+++ b/quicklog/tests/failures/struct_missing_debug.stderr
@@ -0,0 +1,34 @@
+error[E0277]: `SerializeStruct` doesn't implement `std::fmt::Debug`
+  --> tests/failures/struct_missing_debug.rs:12:5
+   |
+12 |     info!(?s1, "struct does not implement Debug");
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `SerializeStruct` cannot be formatted using `{:?}`
+   |
+   = help: the trait `std::fmt::Debug` is not implemented for `SerializeStruct`
+   = note: add `#[derive(Debug)]` to `SerializeStruct` or manually `impl std::fmt::Debug for SerializeStruct`
+note: required by a bound in `debug_check`
+  --> tests/failures/struct_missing_debug.rs:12:5
+   |
+12 |     info!(?s1, "struct does not implement Debug");
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `debug_check`
+   = note: this error originates in the macro `info` (in Nightly builds, run with -Z macro-backtrace for more info)
+help: consider annotating `SerializeStruct` with `#[derive(Debug)]`
+  --> tests/failures/../common/mod.rs
+   |
+   + #[derive(Debug)]
+   |
+
+error[E0277]: `SerializeStruct` doesn't implement `std::fmt::Debug`
+  --> tests/failures/struct_missing_debug.rs:12:5
+   |
+12 |     info!(?s1, "struct does not implement Debug");
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `SerializeStruct` cannot be formatted using `{:?}`
+   |
+   = help: the trait `std::fmt::Debug` is not implemented for `SerializeStruct`
+   = note: add `#[derive(Debug)]` to `SerializeStruct` or manually `impl std::fmt::Debug for SerializeStruct`
+   = note: this error originates in the macro `$crate::format_args` which comes from the expansion of the macro `info` (in Nightly builds, run with -Z macro-backtrace for more info)
+help: consider annotating `SerializeStruct` with `#[derive(Debug)]`
+  --> tests/failures/../common/mod.rs
+   |
+   + #[derive(Debug)]
+   |
diff --git a/quicklog/tests/failures/struct_missing_display.rs b/quicklog/tests/failures/struct_missing_display.rs
new file mode 100644
index 0000000..2ad077e
--- /dev/null
+++ b/quicklog/tests/failures/struct_missing_display.rs
@@ -0,0 +1,13 @@
+use quicklog::info;
+
+#[path = "../common/mod.rs"]
+mod common;
+
+use common::Something;
+
+fn main() {
+    let s1 = Something {
+        some_str: "Hello world 1",
+    };
+    info!(^s1, "struct does not implement Serialize");
+}
diff --git a/quicklog/tests/failures/struct_missing_display.stderr b/quicklog/tests/failures/struct_missing_display.stderr
new file mode 100644
index 0000000..d06924a
--- /dev/null
+++ b/quicklog/tests/failures/struct_missing_display.stderr
@@ -0,0 +1,49 @@
+error[E0277]: the trait bound `Something: Serialize` is not satisfied
+  --> tests/failures/struct_missing_display.rs:12:5
+   |
+12 |     info!(^s1, "struct does not implement Serialize");
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Serialize` is not implemented for `Something`
+   |
+   = help: the following other types implement trait `Serialize`:
+             SerializeStruct
+             BigStruct
+note: required by a bound in `serialize_check`
+  --> tests/failures/struct_missing_display.rs:12:5
+   |
+12 |     info!(^s1, "struct does not implement Serialize");
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `serialize_check`
+   = note: this error originates in the macro `info` (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error[E0599]: no method named `encode` found for struct `Something` in the current scope
+  --> tests/failures/struct_missing_display.rs:12:5
+   |
+12 |     info!(^s1, "struct does not implement Serialize");
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |     |
+   |     method not found in `Something`
+   |
+  ::: tests/failures/../common/mod.rs
+   |
+   | pub(crate) struct Something {
+   | --------------------------- method `encode` not found for this struct
+   |
+   = help: items from traits can only be used if the trait is implemented and in scope
+   = note: the following trait defines an item `encode`, perhaps you need to implement it:
+           candidate #1: `Serialize`
+   = note: this error originates in the macro `quicklog::make_store` which comes from the expansion of the macro `info` (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error[E0599]: no method named `buffer_size_required` found for struct `Something` in the current scope
+  --> tests/failures/struct_missing_display.rs:12:5
+   |
+12 |     info!(^s1, "struct does not implement Serialize");
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ method not found in `Something`
+   |
+  ::: tests/failures/../common/mod.rs
+   |
+   | pub(crate) struct Something {
+   | --------------------------- method `buffer_size_required` not found for this struct
+   |
+   = help: items from traits can only be used if the trait is implemented and in scope
+   = note: the following trait defines an item `buffer_size_required`, perhaps you need to implement it:
+           candidate #1: `Serialize`
+   = note: this error originates in the macro `quicklog::make_store` which comes from the expansion of the macro `info` (in Nightly builds, run with -Z macro-backtrace for more info)
diff --git a/quicklog/tests/failures/struct_missing_serialize.rs b/quicklog/tests/failures/struct_missing_serialize.rs
new file mode 100644
index 0000000..f991d2c
--- /dev/null
+++ b/quicklog/tests/failures/struct_missing_serialize.rs
@@ -0,0 +1,13 @@
+use quicklog::info;
+
+#[path = "../common/mod.rs"]
+mod common;
+
+use common::SerializeStruct;
+
+fn main() {
+    let s1 = SerializeStruct {
+        symbol: "Hello world 1".to_string(),
+    };
+    info!(?s1, "struct does not implement Debug");
+}
diff --git a/quicklog/tests/failures/struct_missing_serialize.stderr b/quicklog/tests/failures/struct_missing_serialize.stderr
new file mode 100644
index 0000000..824fa8b
--- /dev/null
+++ b/quicklog/tests/failures/struct_missing_serialize.stderr
@@ -0,0 +1,34 @@
+error[E0277]: `SerializeStruct` doesn't implement `std::fmt::Debug`
+  --> tests/failures/struct_missing_serialize.rs:12:5
+   |
+12 |     info!(?s1, "struct does not implement Debug");
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `SerializeStruct` cannot be formatted using `{:?}`
+   |
+   = help: the trait `std::fmt::Debug` is not implemented for `SerializeStruct`
+   = note: add `#[derive(Debug)]` to `SerializeStruct` or manually `impl std::fmt::Debug for SerializeStruct`
+note: required by a bound in `debug_check`
+  --> tests/failures/struct_missing_serialize.rs:12:5
+   |
+12 |     info!(?s1, "struct does not implement Debug");
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `debug_check`
+   = note: this error originates in the macro `info` (in Nightly builds, run with -Z macro-backtrace for more info)
+help: consider annotating `SerializeStruct` with `#[derive(Debug)]`
+  --> tests/failures/../common/mod.rs
+   |
+   + #[derive(Debug)]
+   |
+
+error[E0277]: `SerializeStruct` doesn't implement `std::fmt::Debug`
+  --> tests/failures/struct_missing_serialize.rs:12:5
+   |
+12 |     info!(?s1, "struct does not implement Debug");
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `SerializeStruct` cannot be formatted using `{:?}`
+   |
+   = help: the trait `std::fmt::Debug` is not implemented for `SerializeStruct`
+   = note: add `#[derive(Debug)]` to `SerializeStruct` or manually `impl std::fmt::Debug for SerializeStruct`
+   = note: this error originates in the macro `$crate::format_args` which comes from the expansion of the macro `info` (in Nightly builds, run with -Z macro-backtrace for more info)
+help: consider annotating `SerializeStruct` with `#[derive(Debug)]`
+  --> tests/failures/../common/mod.rs
+   |
+   + #[derive(Debug)]
+   |
diff --git a/quicklog/tests/failures/trailing_comma.rs b/quicklog/tests/failures/trailing_comma.rs
new file mode 100644
index 0000000..4b7c892
--- /dev/null
+++ b/quicklog/tests/failures/trailing_comma.rs
@@ -0,0 +1,5 @@
+use quicklog::info;
+
+fn main() {
+    info!("trailing comma",);
+}
diff --git a/quicklog/tests/failures/trailing_comma.stderr b/quicklog/tests/failures/trailing_comma.stderr
new file mode 100644
index 0000000..c2cc28b
--- /dev/null
+++ b/quicklog/tests/failures/trailing_comma.stderr
@@ -0,0 +1,7 @@
+error: unexpected end of input, expected an expression
+ --> tests/failures/trailing_comma.rs:4:5
+  |
+4 |     info!("trailing comma",);
+  |     ^^^^^^^^^^^^^^^^^^^^^^^^
+  |
+  = note: this error originates in the macro `info` (in Nightly builds, run with -Z macro-backtrace for more info)
diff --git a/quicklog/tests/fields.rs b/quicklog/tests/fields.rs
index b68b49a..41280ee 100644
--- a/quicklog/tests/fields.rs
+++ b/quicklog/tests/fields.rs
@@ -1,6 +1,6 @@
 use quicklog::info;
 
-use crate::common::{NestedSomething, Something};
+use common::{NestedSomething, Something};
 
 mod common;
 
@@ -48,7 +48,7 @@ fn main() {
                 "no name field, non-nested field, nested field:"
             ),
             format!("no name field, non-nested field, nested field: s1={:?} borrow_s2_field={} some_inner_field.inner.field.inner.arg=hello world", s1, &s2)
-        );
+    );
     assert_message_equal!(
         info!(
             reuse.debug = ?s1,
diff --git a/quicklog/tests/function.rs b/quicklog/tests/function.rs
index 8ebd024..a9dc224 100644
--- a/quicklog/tests/function.rs
+++ b/quicklog/tests/function.rs
@@ -1,6 +1,6 @@
 use quicklog::info;
 
-use crate::common::{Something, A};
+use common::{Something, A};
 
 mod common;
 
diff --git a/quicklog/tests/move.rs b/quicklog/tests/move.rs
index 0c4e37d..b5b3562 100644
--- a/quicklog/tests/move.rs
+++ b/quicklog/tests/move.rs
@@ -1,6 +1,6 @@
 use quicklog::info;
 
-use crate::common::Something;
+use common::Something;
 
 mod common;
 
diff --git a/quicklog/tests/reference.rs b/quicklog/tests/reference.rs
index 64a2f6c..1742d3b 100644
--- a/quicklog/tests/reference.rs
+++ b/quicklog/tests/reference.rs
@@ -1,6 +1,6 @@
 use quicklog::info;
 
-use crate::common::Something;
+use common::Something;
 
 mod common;
 
diff --git a/quicklog/tests/serialize.rs b/quicklog/tests/serialize.rs
index 4663c32..b7f920e 100644
--- a/quicklog/tests/serialize.rs
+++ b/quicklog/tests/serialize.rs
@@ -1,6 +1,6 @@
 use quicklog::info;
 
-use crate::common::{BigStruct, SerializeStruct};
+use common::{BigStruct, SerializeStruct};
 
 mod common;
 
diff --git a/quicklog/tests/ui.rs b/quicklog/tests/ui.rs
index 90c1bca..2dd11ab 100644
--- a/quicklog/tests/ui.rs
+++ b/quicklog/tests/ui.rs
@@ -1,6 +1,7 @@
 #[test]
 fn ui() {
     let t = trybuild::TestCases::new();
+    t.compile_fail("tests/failures/*.rs");
     t.pass("tests/literal.rs");
     t.pass("tests/level.rs");
     t.pass("tests/closure.rs");