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Diffstat (limited to 'compiler/rustc_error_codes/src/error_codes/E0310.md')
-rw-r--r-- | compiler/rustc_error_codes/src/error_codes/E0310.md | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/compiler/rustc_error_codes/src/error_codes/E0310.md b/compiler/rustc_error_codes/src/error_codes/E0310.md new file mode 100644 index 000000000..8d4311d01 --- /dev/null +++ b/compiler/rustc_error_codes/src/error_codes/E0310.md @@ -0,0 +1,25 @@ +A parameter type is missing a lifetime constraint or has a lifetime that +does not live long enough. + +Erroneous code example: + +```compile_fail,E0310 +// This won't compile because T is not constrained to the static lifetime +// the reference needs +struct Foo<T> { + foo: &'static T +} +``` + +Type parameters in type definitions have lifetimes associated with them that +represent how long the data stored within them is guaranteed to live. This +lifetime must be as long as the data needs to be alive, and missing the +constraint that denotes this will cause this error. + +This will compile, because it has the constraint on the type parameter: + +``` +struct Foo<T: 'static> { + foo: &'static T +} +``` |