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Diffstat (limited to 'compiler/rustc_error_codes/src/error_codes/E0720.md')
| -rw-r--r-- | compiler/rustc_error_codes/src/error_codes/E0720.md | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/compiler/rustc_error_codes/src/error_codes/E0720.md b/compiler/rustc_error_codes/src/error_codes/E0720.md new file mode 100644 index 000000000..40dfa484d --- /dev/null +++ b/compiler/rustc_error_codes/src/error_codes/E0720.md @@ -0,0 +1,13 @@ +An `impl Trait` type expands to a recursive type. + +Erroneous code example: + +```compile_fail,E0720 +fn make_recursive_type() -> impl Sized { + [make_recursive_type(), make_recursive_type()] +} +``` + +An `impl Trait` type must be expandable to a concrete type that contains no +`impl Trait` types. For example the previous example tries to create an +`impl Trait` type `T` that is equal to `[T, T]`. |