[Rust] use pub use instead of duplicated defines for message schema items in message codec

Author: wbprime

sbe-tool/src/main/java/uk/co/real_logic/sbe/generation/rust/RustGenerator.java

@@ -159,16 +159,15 @@ public void generate() throws IOException
                 indent(out, 0, "use crate::*;\n\n");
                 indent(out, 0, "pub use decoder::%sDecoder;\n", formatStructName(msgToken.name()));
                 indent(out, 0, "pub use encoder::%sEncoder;\n\n", formatStructName(msgToken.name()));
+
+                indent(out, 0, "pub use crate::SBE_SCHEMA_ID;\n");
+                indent(out, 0, "pub use crate::SBE_SCHEMA_VERSION;\n");
+                indent(out, 0, "pub use crate::SBE_SEMANTIC_VERSION;\n\n");
+
                 final String blockLengthType = blockLengthType();
                 final String templateIdType = rustTypeName(ir.headerStructure().templateIdType());
-                final String schemaIdType = rustTypeName(ir.headerStructure().schemaIdType());
-                final String schemaVersionType = schemaVersionType();
-                final String semanticVersion = ir.semanticVersion() == null ? "" : ir.semanticVersion();
                 indent(out, 0, "pub const SBE_BLOCK_LENGTH: %s = %d;\n", blockLengthType, msgToken.encodedLength());
-                indent(out, 0, "pub const SBE_TEMPLATE_ID: %s = %d;\n", templateIdType, msgToken.id());
-                indent(out, 0, "pub const SBE_SCHEMA_ID: %s = %d;\n", schemaIdType, ir.id());
-                indent(out, 0, "pub const SBE_SCHEMA_VERSION: %s = %d;\n", schemaVersionType, ir.version());
-                indent(out, 0, "pub const SBE_SEMANTIC_VERSION: &str = \"%s\";\n\n", semanticVersion);
+                indent(out, 0, "pub const SBE_TEMPLATE_ID: %s = %d;\n\n", templateIdType, msgToken.id());
 
                 MessageCoderDef.generateEncoder(ir, out, msgToken, fields, groups, varData);
                 MessageCoderDef.generateDecoder(ir, out, msgToken, fields, groups, varData);