Use require !skip_rust_tests

This changes some tests to use "require !skip_rust_tests".

gdb/testsuite/gdb.rust/dwindex.exp

@@ -16,9 +16,7 @@
 # Test that a rustc-produced .debug_aranges can be read.
 
 load_lib rust-support.exp
-if {[skip_rust_tests]} {
-    return
-}
+require !skip_rust_tests
 
 standard_testfile .rs
 

gdb/testsuite/gdb.rust/expr.exp

@@ -17,7 +17,7 @@
 # Rust compiler.  This serves as a smoke test.
 
 load_lib "rust-support.exp"
-if {[skip_rust_tests]} { return }
+require !skip_rust_tests
 
 gdb_start
 

gdb/testsuite/gdb.rust/fnfield.exp

@@ -16,9 +16,7 @@
 # Test trait object printing.
 
 load_lib rust-support.exp
-if {[skip_rust_tests]} {
-    return
-}
+require !skip_rust_tests
 
 standard_testfile .rs
 if {[prepare_for_testing "failed to prepare" $testfile $srcfile {debug rust}]} {

gdb/testsuite/gdb.rust/generics.exp

@@ -16,9 +16,7 @@
 # Test expressions involving generics.
 
 load_lib rust-support.exp
-if {[skip_rust_tests]} {
-    return
-}
+require !skip_rust_tests
 
 standard_testfile .rs
 if {[prepare_for_testing "failed to prepare" $testfile $srcfile {debug rust}]} {

gdb/testsuite/gdb.rust/methods.exp

@@ -16,9 +16,7 @@
 # Test method calls.
 
 load_lib rust-support.exp
-if {[skip_rust_tests]} {
-    return
-}
+require !skip_rust_tests
 
 standard_testfile .rs
 if {[prepare_for_testing "failed to prepare" $testfile $srcfile {debug rust}]} {

gdb/testsuite/gdb.rust/modules.exp

@@ -16,9 +16,7 @@
 # Test name lookup.
 
 load_lib rust-support.exp
-if {[skip_rust_tests]} {
-    return
-}
+require !skip_rust_tests
 
 standard_testfile .rs
 if {[prepare_for_testing "failed to prepare" $testfile $srcfile {debug rust}]} {

gdb/testsuite/gdb.rust/pp.exp

@@ -17,9 +17,7 @@
 
 load_lib gdb-python.exp
 load_lib rust-support.exp
-if {[skip_rust_tests]} {
-    return
-}
+require !skip_rust_tests
 
 standard_testfile .rs
 if {[prepare_for_testing "failed to prepare" $testfile $srcfile {debug rust}]} {

gdb/testsuite/gdb.rust/rawids.exp

@@ -16,9 +16,7 @@
 # Test raw identifiers.
 
 load_lib rust-support.exp
-if {[skip_rust_tests]} {
-    return
-}
+require !skip_rust_tests
 
 set v [split [rust_compiler_version] .]
 if {[lindex $v 0] == 1 && [lindex $v 1] < 30} {

gdb/testsuite/gdb.rust/rust-style.exp

@@ -16,9 +16,7 @@
 # Test CLI output styling for Rust.
 
 load_lib rust-support.exp
-if {[skip_rust_tests]} {
-    return
-}
+require !skip_rust_tests
 
 save_vars { env(TERM) } {
     # We need an ANSI-capable terminal to get the output.

gdb/testsuite/gdb.rust/simple.exp

@@ -16,9 +16,7 @@
 # Test expression parsing and evaluation that requires Rust compiler.
 
 load_lib rust-support.exp
-if {[skip_rust_tests]} {
-    return
-}
+require !skip_rust_tests
 
 standard_testfile .rs
 if {[prepare_for_testing "failed to prepare" $testfile $srcfile {debug rust}]} {

gdb/testsuite/gdb.rust/traits.exp

@@ -16,9 +16,7 @@
 # Test trait object printing.
 
 load_lib rust-support.exp
-if {[skip_rust_tests]} {
-    return
-}
+require !skip_rust_tests
 
 standard_testfile .rs
 if {[prepare_for_testing "failed to prepare" $testfile $srcfile {debug rust}]} {

gdb/testsuite/gdb.rust/unicode.exp

@@ -16,9 +16,7 @@
 # Test raw identifiers.
 
 load_lib rust-support.exp
-if {[skip_rust_tests]} {
-    return
-}
+require !skip_rust_tests
 
 # Non-ASCII identifiers were allowed starting in 1.53.
 set v [split [rust_compiler_version] .]

gdb/testsuite/gdb.rust/union.exp

@@ -16,9 +16,7 @@
 # Test of "union" for Rust.
 
 load_lib rust-support.exp
-if {[skip_rust_tests]} {
-    return
-}
+require !skip_rust_tests
 
 standard_testfile .rs
 if {[prepare_for_testing "failed to prepare" $testfile $srcfile {debug rust}]} {

gdb/testsuite/gdb.rust/unsized.exp

@@ -16,9 +16,7 @@
 # Test expression parsing and evaluation that requires Rust compiler.
 
 load_lib rust-support.exp
-if {[skip_rust_tests]} {
-    return
-}
+require !skip_rust_tests
 
 standard_testfile .rs
 if {[prepare_for_testing "failed to prepare" $testfile $srcfile {debug rust}]} {

gdb/testsuite/gdb.rust/watch.exp

@@ -16,9 +16,7 @@
 # Test watch -location with Rust.
 
 load_lib rust-support.exp
-if {[skip_rust_tests]} {
-    return
-}
+require !skip_rust_tests
 
 standard_testfile .rs
 if {[prepare_for_testing "failed to prepare" $testfile $srcfile {debug rust}]} {