moved crates in lib/ to src/, renamed crates, modified some files' text (#660)

moved crates in lib/ to src/, renamed crates, modified some files' text (#660)

cranelift/filetests/src/test_cat.rs

@@ -0,0 +1,37 @@
+//! The `cat` subtest.
+
+use crate::subtest::{self, Context, SubTest, SubtestResult};
+use cranelift_codegen::ir::Function;
+use cranelift_reader::TestCommand;
+use std::borrow::Cow;
+
+/// Object implementing the `test cat` sub-test.
+///
+/// This command is used for testing the parser and function printer. It simply parses a function
+/// and prints it out again.
+///
+/// The result is verified by filecheck.
+struct TestCat;
+
+pub fn subtest(parsed: &TestCommand) -> SubtestResult<Box<SubTest>> {
+    assert_eq!(parsed.command, "cat");
+    if !parsed.options.is_empty() {
+        Err(format!("No options allowed on {}", parsed))
+    } else {
+        Ok(Box::new(TestCat))
+    }
+}
+
+impl SubTest for TestCat {
+    fn name(&self) -> &'static str {
+        "cat"
+    }
+
+    fn needs_verifier(&self) -> bool {
+        false
+    }
+
+    fn run(&self, func: Cow<Function>, context: &Context) -> SubtestResult<()> {
+        subtest::run_filecheck(&func.display(context.isa).to_string(), context)
+    }
+}