Rollup merge of #67551 - ldm0:E0627, r=Dylan-DPC

Add long error code explanation message for E0627

Part of #61137.

r? @GuillaumeGomez

1 files changed, 30 insertions, 0 deletions

diff --git a/src/librustc_error_codes/error_codes/E0627.md b/src/librustc_error_codes/error_codes/E0627.md
new file mode 100644
index 00000000000..21358e1e567
--- /dev/null
+++ b/src/librustc_error_codes/error_codes/E0627.md
@@ -0,0 +1,30 @@
+A yield expression was used outside of the generator literal.
+
+Erroneous code example:
+
+```compile_fail,E0627
+#![feature(generators, generator_trait)]
+
+fn fake_generator() -> &'static str {
+    yield 1;
+    return "foo"
+}
+
+fn main() {
+    let mut generator = fake_generator;
+}
+```
+
+The error occurs because keyword `yield` can only be used inside the generator
+literal. This can be fixed by constructing the generator correctly.
+
+```
+#![feature(generators, generator_trait)]
+
+fn main() {
+    let mut generator = || {
+        yield 1;
+        return "foo"
+    };
+}
+```