diff --git a/test cases/failing/121 structured source empty string/main.rs b/test cases/failing/121 structured source empty string/main.rs
new file mode 100644
index 000000000..e69de29bb
diff --git a/test cases/failing/121 structured source empty string/meson.build b/test cases/failing/121 structured source empty string/meson.build
new file mode 100644
index 000000000..071599147
--- /dev/null
+++ b/test cases/failing/121 structured source empty string/meson.build	
@@ -0,0 +1,13 @@
+project('structured_source with empty string key')
+
+if not add_languages(['rust'], required : false, native : false)
+  error('MESON_SKIP_TEST: Rust is required but not found.')
+endif
+
+executable(
+  'main',
+  structured_sources(
+    'main.rs',
+    {'' : 'main.rs'},
+  )
+)
diff --git a/test cases/failing/121 structured source empty string/test.json b/test cases/failing/121 structured source empty string/test.json
new file mode 100644
index 000000000..feb2af9e7
--- /dev/null
+++ b/test cases/failing/121 structured source empty string/test.json	
@@ -0,0 +1,7 @@
+{
+    "stdout": [
+        {
+            "line": "test cases/failing/121 structured source empty string/meson.build:7:0: ERROR: structured_sources: keys to dictionary argument may not be an empty string."
+        }
+    ]
+}
diff --git a/test cases/failing/122 structured_sources conflicts/main.rs b/test cases/failing/122 structured_sources conflicts/main.rs
new file mode 100644
index 000000000..e69de29bb
diff --git a/test cases/failing/122 structured_sources conflicts/meson.build b/test cases/failing/122 structured_sources conflicts/meson.build
new file mode 100644
index 000000000..561ad86bc
--- /dev/null
+++ b/test cases/failing/122 structured_sources conflicts/meson.build	
@@ -0,0 +1,17 @@
+project('structured_source with empty string key')
+
+if not add_languages(['rust'], required : false, native : false)
+  error('MESON_SKIP_TEST: Rust is required but not found.')
+endif
+
+executable(
+  'main',
+  [
+    structured_sources(
+      'main.rs',
+    ),
+    structured_sources(
+      'main.rs',
+    ),
+  ],
+)
diff --git a/test cases/failing/122 structured_sources conflicts/test.json b/test cases/failing/122 structured_sources conflicts/test.json
new file mode 100644
index 000000000..4833f86b1
--- /dev/null
+++ b/test cases/failing/122 structured_sources conflicts/test.json	
@@ -0,0 +1,7 @@
+{
+    "stdout": [
+        {
+            "line": "test cases/failing/122 structured_sources conflicts/meson.build:7:0: ERROR: Conflicting sources in structured sources: main.rs"
+        }
+    ]
+}
diff --git a/test cases/rust/18 structured sources/gen.py b/test cases/rust/18 structured sources/gen.py
new file mode 100755
index 000000000..16e5c04e1
--- /dev/null
+++ b/test cases/rust/18 structured sources/gen.py	
@@ -0,0 +1,20 @@
+#!/usr/bin/env python3
+
+import argparse
+import textwrap
+
+
+def main() -> None:
+    parser = argparse.ArgumentParser()
+    parser.add_argument('output')
+    args = parser.parse_args()
+
+    with open(args.output, 'w') as f:
+        f.write(textwrap.dedent('''\
+            pub fn bar() -> () {
+                println!("Hello, World!");
+            }'''))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/test cases/rust/18 structured sources/meson.build b/test cases/rust/18 structured sources/meson.build
new file mode 100644
index 000000000..8fa044364
--- /dev/null
+++ b/test cases/rust/18 structured sources/meson.build	
@@ -0,0 +1,39 @@
+project('structured input', 'rust')
+
+foo_mod_rs = configure_file(
+  input : 'src/foo.rs.in',
+  output : 'mod.rs',
+  configuration : {'message' : 'Hello, World!'},
+)
+
+conf_file = executable(
+  'main_conf_file',
+  structured_sources(
+    'src/main.rs',
+    {'foo' : [foo_mod_rs]},
+  ),
+)
+
+ct = custom_target(
+  'foo.rs',
+  output : 'foo.rs',
+  command : ['gen.py', '@OUTPUT@'],
+)
+
+target = executable(
+  'main_custom_target',
+  structured_sources(
+    ['src/main.rs', ct],
+  ),
+)
+
+# Should not be coppied
+executable(
+  'no_copy_target',
+  structured_sources(
+    ['src2/main-unique.rs'],
+    {'foo': 'src2/foo/mod.rs'},
+  ),
+)
+
+test('no-copy', find_program('no_copy_test.py'), args : meson.current_build_dir())
diff --git a/test cases/rust/18 structured sources/no_copy_test.py b/test cases/rust/18 structured sources/no_copy_test.py
new file mode 100755
index 000000000..91506b20f
--- /dev/null
+++ b/test cases/rust/18 structured sources/no_copy_test.py	
@@ -0,0 +1,18 @@
+#!/usr/bin/env python3
+
+import argparse
+import os
+
+
+def main() -> None:
+    parser = argparse.ArgumentParser()
+    parser.add_argument('builddir')
+    args = parser.parse_args()
+
+    for _, _, files in os.walk(args.builddir):
+        if 'main-unique.rs' in files:
+            exit(1)
+
+
+if __name__ == "__main__":
+    main()
diff --git a/test cases/rust/18 structured sources/src/foo.rs.in b/test cases/rust/18 structured sources/src/foo.rs.in
new file mode 100644
index 000000000..4f3fc4263
--- /dev/null
+++ b/test cases/rust/18 structured sources/src/foo.rs.in	
@@ -0,0 +1,4 @@
+
+pub fn bar() -> () {
+    println!("@message@");
+}
diff --git a/test cases/rust/18 structured sources/src/main.rs b/test cases/rust/18 structured sources/src/main.rs
new file mode 100644
index 000000000..3ffeee2be
--- /dev/null
+++ b/test cases/rust/18 structured sources/src/main.rs	
@@ -0,0 +1,5 @@
+mod foo;
+
+fn main() {
+    foo::bar();
+}
diff --git a/test cases/rust/18 structured sources/src2/foo/mod.rs b/test cases/rust/18 structured sources/src2/foo/mod.rs
new file mode 100644
index 000000000..9463d95b8
--- /dev/null
+++ b/test cases/rust/18 structured sources/src2/foo/mod.rs	
@@ -0,0 +1,4 @@
+
+pub fn bar() -> () {
+    println!("Hello, World!");
+}
diff --git a/test cases/rust/18 structured sources/src2/main-unique.rs b/test cases/rust/18 structured sources/src2/main-unique.rs
new file mode 100644
index 000000000..3ffeee2be
--- /dev/null
+++ b/test cases/rust/18 structured sources/src2/main-unique.rs	
@@ -0,0 +1,5 @@
+mod foo;
+
+fn main() {
+    foo::bar();
+}