chore: rust checkfmt

Author: ethanyzhang

Diff for: Makefile

@@ -49,12 +49,12 @@ generate: $(GENERATED_TARGETS)
 ast/internal/fbast: ast/ast.fbs
 	$(GO_GENERATE) ./ast
 libflux/src/libflux/ast/flatbuffers/ast_generated.rs: ast/ast.fbs
-	flatc --rust -o libflux/src/libflux/ast/flatbuffers ast/ast.fbs
+	flatc --rust -o libflux/src/libflux/ast/flatbuffers ast/ast.fbs && rustfmt $@
 
 semantic/internal/fbsemantic: semantic/semantic.fbs
 	$(GO_GENERATE) ./semantic
 libflux/src/libflux/semantic/flatbuffers/semantic_generated.rs: semantic/semantic.fbs
-	flatc --rust -o libflux/src/libflux/semantic/flatbuffers semantic/semantic.fbs
+	flatc --rust -o libflux/src/libflux/semantic/flatbuffers semantic/semantic.fbs && rustfmt $@
 
 # Force a second expansion to happen so the call to go_deps works correctly.
 .SECONDEXPANSION:

Diff for: etc/checkfmt.sh

@@ -26,4 +26,14 @@ if [ "$HAS_FMT_ERR" -eq "1" ]; then
     echo 'run "make fmt"' && \
     echo ''
 fi
+
+cd libflux
+FMT_OUT="$(cargo fmt --all -- --check)"
+if [[ -n "$FMT_OUT" ]]; then
+    echo 'Commit includes files that are not rustfmt-ed' && \
+    echo 'run "make fmt"' && \
+    echo ''
+    HAS_FMT_ERR=1
+fi
+
 exit "$HAS_FMT_ERR"