--> $DIR/issue-15783.rs:8:19
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LL | let msg = foo(x);
- | ^ expected slice, found array of 1 element
+ | ^ expected slice `[&str]`, found array `[&str; 1]`
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= note: expected enum `std::option::Option<&[&str]>`
found enum `std::option::Option<&[&str; 1]>`