Fix bug in generated Groovy code (#6082)

---------

Signed-off-by: Ben Sherman <bentshermann@gmail.com>

Author: bentsherman

modules/nextflow/src/main/groovy/nextflow/script/parser/v2/ScriptLoaderV2.groovy

@@ -115,20 +115,25 @@ class ScriptLoaderV2 implements ScriptLoader {
             })
         }
         catch( CompilationFailedException e ) {
-            final errorListener = new StandardErrorListener('full', false)
-            println()
-            errorListener.beforeErrors()
-            for( final message : compiler.getErrors() ) {
-                final cause = message.getCause()
-                final source = getSource(cause.getSourceLocator(), compiler)
-                final filename = getRelativePath(source, scriptPath)
-                errorListener.onError(cause, filename, source)
-            }
-            errorListener.afterErrors()
+            if( scriptPath )
+                printErrors(scriptPath)
             throw new ScriptCompilationException("Script compilation failed", e)
         }
     }
 
+    private void printErrors(Path path) {
+        final errorListener = new StandardErrorListener('full', false)
+        println()
+        errorListener.beforeErrors()
+        for( final message : compiler.getErrors() ) {
+            final cause = message.getCause()
+            final source = getSource(cause.getSourceLocator(), compiler)
+            final filename = getRelativePath(source, path)
+            errorListener.onError(cause, filename, source)
+        }
+        errorListener.afterErrors()
+    }
+
     private SourceUnit getSource(String sourceLocator, ScriptCompiler compiler) {
         for( final su : compiler.getSources() ) {
             if( sourceLocator == su.getName() )

modules/nextflow/src/test/groovy/nextflow/script/parser/v2/ScriptLoaderV2Test.groovy

@@ -83,5 +83,40 @@ class ScriptLoaderV2Test extends Specification {
         cleanup:
         file.parent.deleteDir()
     }
-    
+
+    def 'should register workflow definition' () {
+
+        given:
+        def session = new Session()
+        def parser = new ScriptLoaderV2(session)
+
+        def TEXT = '''
+
+            workflow hello {
+                take:
+                foo ; bar
+
+                main:
+                def foobar = foo + bar
+
+                emit:
+                result = foobar
+            }
+
+            workflow {
+                hello('foo', 'bar')
+            }
+            '''
+
+        when:
+        parser.parse(TEXT)
+        parser.runScript()
+        def meta = ScriptMeta.get(parser.getScript())
+
+        then:
+        meta.definitions.size() == 2
+        meta.getWorkflow('hello').declaredInputs == ['foo', 'bar']
+        meta.getWorkflow('hello').declaredOutputs == ['result']
+    }
+
 }

modules/nf-lang/src/main/java/nextflow/script/control/ScriptToGroovyVisitor.java

@@ -167,6 +167,7 @@ private void visitWorkflowEmits(Statement emits, Statement main) {
             }
             else if( emit instanceof AssignmentExpression ae ) {
                 var target = (VariableExpression)ae.getLeftExpression();
+                code.addStatement(assignS(target, emit));
                 es.setExpression(callThisX("_emit_", args(constX(target.getName()))));
                 code.addStatement(es);
             }