unix_sigpipe: Replace inherit with sig_dfl in syntax tests

The `sig_dfl` variant of the attribute is the most likely variant to be
stabilized first, and thus to become the "most allowed" variant of the
attribute. Because of this, it is the most appropriate variant to use in
syntax tests, because even if the most allowed variant is used, the
compiler shall still emit errors if it e.g. is used in the wrong places.

tests/ui/attributes/unix_sigpipe/unix_sigpipe-crate.rs

@@ -1,4 +1,4 @@
 #![feature(unix_sigpipe)]
-#![unix_sigpipe = "inherit"] //~ error: `unix_sigpipe` attribute cannot be used at crate level
+#![unix_sigpipe = "sig_dfl"] //~ error: `unix_sigpipe` attribute cannot be used at crate level
 
 fn main() {}

tests/ui/attributes/unix_sigpipe/unix_sigpipe-crate.stderr

@@ -1,16 +1,16 @@
 error: `unix_sigpipe` attribute cannot be used at crate level
   --> $DIR/unix_sigpipe-crate.rs:2:1
    |
-LL | #![unix_sigpipe = "inherit"]
+LL | #![unix_sigpipe = "sig_dfl"]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 LL |
 LL | fn main() {}
    |    ---- the inner attribute doesn't annotate this function
    |
 help: perhaps you meant to use an outer attribute
    |
-LL - #![unix_sigpipe = "inherit"]
-LL + #[unix_sigpipe = "inherit"]
+LL - #![unix_sigpipe = "sig_dfl"]
+LL + #[unix_sigpipe = "sig_dfl"]
    |
 
 error: aborting due to 1 previous error

tests/ui/attributes/unix_sigpipe/unix_sigpipe-list.rs

@@ -1,4 +1,4 @@
 #![feature(unix_sigpipe)]
 
-#[unix_sigpipe(inherit)] //~ error: malformed `unix_sigpipe` attribute input
+#[unix_sigpipe(sig_dfl)] //~ error: malformed `unix_sigpipe` attribute input
 fn main() {}

tests/ui/attributes/unix_sigpipe/unix_sigpipe-list.stderr

@@ -1,7 +1,7 @@
 error: malformed `unix_sigpipe` attribute input
   --> $DIR/unix_sigpipe-list.rs:3:1
    |
-LL | #[unix_sigpipe(inherit)]
+LL | #[unix_sigpipe(sig_dfl)]
    | ^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[unix_sigpipe = "inherit|sig_ign|sig_dfl"]`
 
 error: aborting due to 1 previous error

tests/ui/attributes/unix_sigpipe/unix_sigpipe-non-main-fn.rs

@@ -1,6 +1,6 @@
 #![feature(unix_sigpipe)]
 
-#[unix_sigpipe = "inherit"] //~ error: `unix_sigpipe` attribute can only be used on `fn main()`
+#[unix_sigpipe = "sig_dfl"] //~ error: `unix_sigpipe` attribute can only be used on `fn main()`
 fn f() {}
 
 fn main() {}

tests/ui/attributes/unix_sigpipe/unix_sigpipe-non-main-fn.stderr

@@ -1,7 +1,7 @@
 error: `unix_sigpipe` attribute can only be used on `fn main()`
   --> $DIR/unix_sigpipe-non-main-fn.rs:3:1
    |
-LL | #[unix_sigpipe = "inherit"]
+LL | #[unix_sigpipe = "sig_dfl"]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: aborting due to 1 previous error

tests/ui/attributes/unix_sigpipe/unix_sigpipe-non-root-main.rs

@@ -1,7 +1,7 @@
 #![feature(unix_sigpipe)]
 
 mod m {
-    #[unix_sigpipe = "inherit"] //~ error: `unix_sigpipe` attribute can only be used on root `fn main()`
+    #[unix_sigpipe = "sig_dfl"] //~ error: `unix_sigpipe` attribute can only be used on root `fn main()`
     fn main() {}
 }
 

tests/ui/attributes/unix_sigpipe/unix_sigpipe-non-root-main.stderr

@@ -1,7 +1,7 @@
 error: `unix_sigpipe` attribute can only be used on root `fn main()`
   --> $DIR/unix_sigpipe-non-root-main.rs:4:5
    |
-LL |     #[unix_sigpipe = "inherit"]
+LL |     #[unix_sigpipe = "sig_dfl"]
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: aborting due to 1 previous error

tests/ui/attributes/unix_sigpipe/unix_sigpipe-start.rs

@@ -2,5 +2,5 @@
 #![feature(unix_sigpipe)]
 
 #[start]
-#[unix_sigpipe = "inherit"] //~ error: `unix_sigpipe` attribute can only be used on `fn main()`
+#[unix_sigpipe = "sig_dfl"] //~ error: `unix_sigpipe` attribute can only be used on `fn main()`
 fn custom_start(argc: isize, argv: *const *const u8) -> isize { 0 }

tests/ui/attributes/unix_sigpipe/unix_sigpipe-start.stderr

@@ -1,7 +1,7 @@
 error: `unix_sigpipe` attribute can only be used on `fn main()`
   --> $DIR/unix_sigpipe-start.rs:5:1
    |
-LL | #[unix_sigpipe = "inherit"]
+LL | #[unix_sigpipe = "sig_dfl"]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: aborting due to 1 previous error

tests/ui/attributes/unix_sigpipe/unix_sigpipe-struct.rs

@@ -1,6 +1,6 @@
 #![feature(unix_sigpipe)]
 
-#[unix_sigpipe = "inherit"] //~ error: `unix_sigpipe` attribute can only be used on `fn main()`
+#[unix_sigpipe = "sig_dfl"] //~ error: `unix_sigpipe` attribute can only be used on `fn main()`
 struct S;
 
 fn main() {}

tests/ui/attributes/unix_sigpipe/unix_sigpipe-struct.stderr

@@ -1,7 +1,7 @@
 error: `unix_sigpipe` attribute can only be used on `fn main()`
   --> $DIR/unix_sigpipe-struct.rs:3:1
    |
-LL | #[unix_sigpipe = "inherit"]
+LL | #[unix_sigpipe = "sig_dfl"]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: aborting due to 1 previous error