diff options
| -rw-r--r-- | src/librustc/middle/typeck/check/writeback.rs | 6 | ||||
| -rw-r--r-- | src/libsyntax/diagnostics/macros.rs | 7 | ||||
| -rw-r--r-- | src/test/compile-fail/coerce-bare-fn-to-closure-and-proc.rs | 6 |
3 files changed, 15 insertions, 4 deletions
diff --git a/src/librustc/middle/typeck/check/writeback.rs b/src/librustc/middle/typeck/check/writeback.rs index 56dec61d410..b53318861b8 100644 --- a/src/librustc/middle/typeck/check/writeback.rs +++ b/src/librustc/middle/typeck/check/writeback.rs @@ -1,4 +1,4 @@ -// Copyright 2012 The Rust Project Developers. See the COPYRIGHT +// Copyright 2014 The Rust Project Developers. See the COPYRIGHT // file at the top-level directory of this distribution and at // http://rust-lang.org/COPYRIGHT. // @@ -282,7 +282,9 @@ impl<'cx, 'tcx> WritebackCx<'cx, 'tcx> { } _ => { span_err!(self.tcx().sess, reason.span(self.tcx()), E0100, - "cannot coerce non-statically resolved bare fn"); + "cannot coerce non-statically resolved bare fn to closure"); + span_help!(self.tcx().sess, reason.span(self.tcx()), + "consider embedding the function in a closure"); } } diff --git a/src/libsyntax/diagnostics/macros.rs b/src/libsyntax/diagnostics/macros.rs index c344168b62a..b4bf793d4e1 100644 --- a/src/libsyntax/diagnostics/macros.rs +++ b/src/libsyntax/diagnostics/macros.rs @@ -40,6 +40,13 @@ macro_rules! span_note( ) #[macro_export] +macro_rules! span_help( + ($session:expr, $span:expr, $($message:tt)*) => ({ + ($session).span_help($span, format!($($message)*).as_slice()) + }) +) + +#[macro_export] macro_rules! register_diagnostics( ($($code:tt),*) => ( $(register_diagnostic!($code))* diff --git a/src/test/compile-fail/coerce-bare-fn-to-closure-and-proc.rs b/src/test/compile-fail/coerce-bare-fn-to-closure-and-proc.rs index c165802d61f..087ebf4e28c 100644 --- a/src/test/compile-fail/coerce-bare-fn-to-closure-and-proc.rs +++ b/src/test/compile-fail/coerce-bare-fn-to-closure-and-proc.rs @@ -13,7 +13,9 @@ fn foo() {} fn main() { let f = foo; let f_closure: || = f; - //~^ ERROR: cannot coerce non-statically resolved bare fn + //~^ ERROR: cannot coerce non-statically resolved bare fn to closure + //~^ HELP: consider embedding the function in a closure let f_proc: proc() = f; - //~^ ERROR: cannot coerce non-statically resolved bare fn + //~^ ERROR: cannot coerce non-statically resolved bare fn to closure + //~^ HELP: consider embedding the function in a closure } |