Rewrite core-no-fp-fmt-parse test in Rust

src/tools/run-make-support/src/rustc.rs

@@ -104,6 +104,20 @@ impl Rustc {
         self
     }
 
+    /// Specify the crate type.
+    pub fn crate_type(&mut self, crate_type: &str) -> &mut Self {
+        self.cmd.arg("--crate-type");
+        self.cmd.arg(crate_type);
+        self
+    }
+
+    /// Specify the edition year.
+    pub fn edition(&mut self, edition: &str) -> &mut Self {
+        self.cmd.arg("--edition");
+        self.cmd.arg(edition);
+        self
+    }
+
     /// Generic command arguments provider. Use `.arg("-Zname")` over `.arg("-Z").arg("arg")`.
     /// This method will panic if a plain `-Z` or `-C` is passed, or if `-Z <name>` or `-C <name>`
     /// is passed (note the space).

src/tools/tidy/src/allowed_run_make_makefiles.txt

@@ -31,7 +31,6 @@ run-make/compiler-rt-works-on-mingw/Makefile
 run-make/compressed-debuginfo/Makefile
 run-make/const-prop-lint/Makefile
 run-make/const_fn_mir/Makefile
-run-make/core-no-fp-fmt-parse/Makefile
 run-make/core-no-oom-handling/Makefile
 run-make/crate-data-smoke/Makefile
 run-make/crate-hash-rustc-version/Makefile

tests/run-make/core-no-fp-fmt-parse/rmake.rs

@@ -0,0 +1,17 @@
+// This test checks that the core library of Rust can be compiled without enabling
+// support for formatting and parsing floating-point numbers.
+
+extern crate run_make_support;
+
+use run_make_support::rustc;
+use std::path::PathBuf;
+
+fn main() {
+    rustc()
+        .edition("2021")
+        .arg("-Dwarnings")
+        .crate_type("rlib")
+        .input("../../../library/core/src/lib.rs")
+        .cfg("no_fp_fmt_parse")
+        .run();
+}