[TMP] Repros for crashes in semantic tests

test/libsolidity/semanticTests/experimental/crash/if_codegen.sol

@@ -0,0 +1,12 @@
+pragma experimental solidity;
+
+contract C {
+    fallback() external {
+        let x: bool;
+
+        if (x) {}
+        else {}
+    }
+}
+// ----
+// (): ->

test/libsolidity/semanticTests/experimental/crash/integer_abs.sol

@@ -0,0 +1,9 @@
+pragma experimental solidity;
+
+contract C {
+    fallback() external {
+        integer.abs();
+    }
+}
+// ----
+// () ->

test/libsolidity/semanticTests/experimental/crash/return_int_literal_crash.sol

@@ -0,0 +1,13 @@
+pragma experimental solidity;
+
+type X = word;
+
+class T: TC {}
+
+instantiation X: TC {
+    function f() -> bool {
+        return 1;
+    }
+}
+// ----
+// () ->

test/libsolidity/semanticTests/experimental/crash/return_string_literal_crash.sol

@@ -0,0 +1,13 @@
+pragma experimental solidity;
+
+type X = word;
+
+class T: TC {}
+
+instantiation X: TC {
+    function f() -> bool {
+        return "";
+    }
+}
+// ----
+// () ->

test/libsolidity/semanticTests/experimental/crash/revert.sol

@@ -0,0 +1,9 @@
+pragma experimental solidity;
+
+contract C {
+    fallback() external {
+        revert;
+    }
+}
+// ----
+// () ->