Add long error explanation for E0628 #61137

1 files changed, 30 insertions, 0 deletions

diff --git a/src/librustc_error_codes/error_codes/E0628.md b/src/librustc_error_codes/error_codes/E0628.md
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+++ b/src/librustc_error_codes/error_codes/E0628.md
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+More than one parameter was used for a generator.
+
+Erroneous code example:
+
+```compile_fail,E0628
+#![feature(generators, generator_trait)]
+
+fn main() {
+    let generator = |a: i32, b: i32| {
+        // error: too many parameters for a generator
+        // Allowed only 0 or 1 parameter
+        yield a;
+    };
+}
+```
+
+At present, it is not permitted to pass more than one explicit
+parameter for a generator.This can be fixed by using only
+0 or 1 parameter for generator. So, for example, we might resolve
+the previous example by passing only one parameter.
+
+```
+#![feature(generators, generator_trait)]
+
+fn main() {
+    let generator = |a: i32| {
+        yield a;
+    };
+}
+```