fix: prevent newlines around quotes in macro invocations

src/expr.rs

@@ -1593,6 +1593,12 @@ pub(crate) fn can_be_overflowed_expr(
         | ast::ExprKind::While(..) => {
             context.config.combine_control_expr() && context.use_block_indent() && args_len == 1
         }
+        ast::ExprKind::Lit(lit) => {
+            context.config.style_edition() >= StyleEdition::Edition2027
+                && args_len == 1
+                && lit.kind == LitKind::Str
+                && lit.symbol.as_str().contains('\n')
+        }
 
         // Handle always block-like expressions
         ast::ExprKind::Gen(..)

tests/source/issue_5029.rs

@@ -0,0 +1,95 @@
+//@ rustfmt-style_edition: 2027
+
+pub const MAC: &str = foo!("
+    foo
+    bar
+");
+
+pub const SHORT_MAC: &str = f!("
+    foo
+    bar
+");
+
+pub const LONG_MAC: &str = long_foo!("
+    foo
+    bar
+");
+
+pub const FUN: &str = foo("
+    foo
+    bar
+");
+
+pub const SHORT_FUN: &str = f("
+    foo
+    bar
+");
+
+pub const LONG_FUN: &str = long_foo("
+    foo
+    bar
+");
+
+pub const BAR: &str = bar!("
+    foo bar
+");
+
+pub const BAZ: &str = baz!(
+    "
+    foo
+    bar
+"
+);
+
+fn main() {
+    let bytes1 = hex!("
+        00010203 04050607
+        08090a0b 0c0d0e0f
+    ");
+}
+
+// Default settings: `fn_call_width` is 60. `max_width` is 100.
+
+// functions:
+
+// First line string length is 59. Line length is 98.
+pub const ABCDEFGHIJKLMNO: &str = foo("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456
+    next_line
+");
+
+// First line string length is 60. Line length is 98.
+pub const ABCDEFGHIJKLMN: &str = foo("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz01234567
+    next_line
+");
+
+// First line string length is 59. Line length is 99.
+pub const ABCDEFGHIJKLMNOP: &str = foo("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456
+    next_line
+");
+
+// First line string length is 60. Line length is 99.
+pub const ABCDEFGHIJKLMNO: &str = foo("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz01234567
+    next_line
+");
+
+// function macros:
+
+// First line string length is 59. Line length is 98.
+pub const ABCDEFGHIJKLMN: &str = foo!("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456
+    next_line
+");
+
+// First line string length is 60. Line length is 98.
+pub const ABCDEFGHIJKLM: &str = foo!("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz01234567
+    next_line
+");
+
+// First line string length is 59. Line length is 99.
+pub const ABCDEFGHIJKLMNO: &str = foo!("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456
+    next_line
+");
+
+// First line string length is 60. Line length is 99.
+pub const ABCDEFGHIJKLMN: &str = foo!("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz01234567
+    next_line
+");

tests/target/issue_5029.rs

@@ -0,0 +1,103 @@
+//@ rustfmt-style_edition: 2027
+
+pub const MAC: &str = foo!("
+    foo
+    bar
+");
+
+pub const SHORT_MAC: &str = f!("
+    foo
+    bar
+");
+
+pub const LONG_MAC: &str = long_foo!("
+    foo
+    bar
+");
+
+pub const FUN: &str = foo("
+    foo
+    bar
+");
+
+pub const SHORT_FUN: &str = f("
+    foo
+    bar
+");
+
+pub const LONG_FUN: &str = long_foo("
+    foo
+    bar
+");
+
+pub const BAR: &str = bar!("
+    foo bar
+");
+
+pub const BAZ: &str = baz!("
+    foo
+    bar
+");
+
+fn main() {
+    let bytes1 = hex!("
+        00010203 04050607
+        08090a0b 0c0d0e0f
+    ");
+}
+
+// Default settings: `fn_call_width` is 60. `max_width` is 100.
+
+// functions:
+
+// First line string length is 59. Line length is 98.
+pub const ABCDEFGHIJKLMNO: &str = foo("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456
+    next_line
+");
+
+// First line string length is 60. Line length is 98.
+pub const ABCDEFGHIJKLMN: &str = foo(
+    "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz01234567
+    next_line
+",
+);
+
+// First line string length is 59. Line length is 99.
+pub const ABCDEFGHIJKLMNOP: &str =
+    foo("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456
+    next_line
+");
+
+// First line string length is 60. Line length is 99.
+pub const ABCDEFGHIJKLMNO: &str = foo(
+    "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz01234567
+    next_line
+",
+);
+
+// function macros:
+
+// First line string length is 59. Line length is 98.
+pub const ABCDEFGHIJKLMN: &str = foo!("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456
+    next_line
+");
+
+// First line string length is 60. Line length is 98.
+pub const ABCDEFGHIJKLM: &str = foo!(
+    "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz01234567
+    next_line
+"
+);
+
+// First line string length is 59. Line length is 99.
+pub const ABCDEFGHIJKLMNO: &str =
+    foo!("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456
+    next_line
+");
+
+// First line string length is 60. Line length is 99.
+pub const ABCDEFGHIJKLMN: &str = foo!(
+    "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz01234567
+    next_line
+"
+);